Fiber Optic Network Patents (Class 380/256)
  • Patent number: 10948342
    Abstract: The present invention relates to a Bell state measurement apparatus capable of increasing a probability in which a determination that a Bell state measurement fails by using an optical fiber.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: March 16, 2021
    Assignee: Korea Research Institute of Standards and Science
    Inventors: Sang Min Lee, Hee Su Park
  • Patent number: 10917236
    Abstract: Systems, apparatuses, methods, and computer program products are disclosed for session authentication. An example method includes receiving, by decoding circuitry and over a quantum line, a set of qbits generated based on a first set of quantum bases. The example method further includes decoding, by the decoding circuitry and based on a second set of quantum bases, the set of qbits to generate a decoded set of bits. The example method further includes generating, by session authentication circuitry, a session key based on the decoded set of bits.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: February 9, 2021
    Assignee: WELLS FARGO BANK, N.A.
    Inventor: Masoud Vakili
  • Patent number: 10911228
    Abstract: A one-dimensional modulation continuous-variable quantum key distribution method is provided. The method includes transmitting, at a transmit end, a signal light field that passes through a first amplitude modulator and a first signal adjustment apparatus, and a reference light field, to an optical fiber combiner, and to a receive end through a quantum transmission channel. The method also includes separating, at the receive end, a quantum signal after the quantum signal passes through a second signal adjustment apparatus and an optical fiber splitter; and transmitting a separated reference light field and a separated signal light field to a measurement apparatus after the separated reference light field passes through a third signal adjustment apparatus and a phase modulator. Signal amplitude modulation and phase locking can be implemented by an amplitude modulator and a phase modulator, thereby simplifying the structure of the apparatus and reducing production costs.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: February 2, 2021
    Assignee: Shanxi University
    Inventors: Xuyang Wang, Yongmin Li
  • Patent number: 10903992
    Abstract: Point Optical Link communication security to help resolve the high resource requirements and lack of a trustworthy source of high randomness of existing communication security solutions is described herein. The scheme includes a novel model and a physical layer symmetric cryptographic key generation technique that focuses on exploiting the physical randomness manifested by the Polarization Mode Dispersion effect. This randomness makes it extremely difficult for an adversary to generate the same cryptographic keys as the communicating parties. 128 bit keys with low final mismatch rates (.ltoreq.10%) can be generated, which could easily be truncated for 64-bit and 32-bit keys if necessary.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: January 26, 2021
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Imam Uz Zaman, Anthony Bahadir Lopez, Mohammad Abdullah Al Faruque, Ozdal Boyraz
  • Patent number: 10887093
    Abstract: In some example embodiments, there is provided an apparatus. The apparatus may include a frequency shifter configured to shift a reference signal to a portion of an optical spectrum separate from another portion of the optical spectrum being used by a signal of interest; and a polarization rotator configured to provide the reference signal shifted and rotated by the polarization rotator. The apparatus may also include a modulator configured to modulate the signal of interest with coherent state information from which quantum key information is derivable. Related systems, methods, and articles of manufacture are also disclosed.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: January 5, 2021
    Assignee: Nokia Technologies Oy
    Inventors: Hongwei Li, Enrique Martin-Lopez
  • Patent number: 10862678
    Abstract: A method of communicating information includes generating a photon pulse using an entangled photon generator. The photon pulse includes a photon pulse state and is temporally positioned within a photon pulse time slot. When the photon pulse is in a populated photon pulse state, it includes first and second entangled photons and the entangled photon generator outputs the first entangled photon into a first photon pathway optically coupled to an output end photon detector unit, and the second entangled photon into a second photon pathway, optically coupled to a receiving end photon detector unit. The method also includes determining the photon pulse state of the photon pulse using the output end photon detector unit, which outputs a signal regarding the photon pulse state of the photon pulse into a signal pathway to provide the receiving end photon detector unit with information regarding the photon pulse state of the photon pulse.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: December 8, 2020
    Assignee: Corning Incorporated
    Inventors: Nikolay A Kaliteevskiy, Michal Mlejnek, Daniel Aloysius Nolan
  • Patent number: 10855453
    Abstract: Systems, apparatuses, methods, and computer program products are disclosed for session authentication. An example method includes determining, by decoding circuitry, a set of optical path lengths to use for measurement. The example method further includes receiving, by the decoding circuitry, a set of time-bin qubits. The example method further includes measuring, by the decoding circuitry and based on the determined set of optical path lengths, the set of time-bin qubits to generate a measured set of time-bin qubits. The example method further includes generating, by session authentication circuitry, a session key based on the measured set of time-bin qubits.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: December 1, 2020
    Assignee: WELLS FARGO BANK, N.A.
    Inventor: Masoud Vakili
  • Patent number: 10823866
    Abstract: In some embodiments, a method and apparatus, as well as an article, may operate to determine downhole properties based on detected optical signals. An optical detection system can include a fiber optic cable having a sensing location to generate a backscattered Rayleigh signal representative of measurement parameters. The optical detection system can further include a light source to transmit a measurement signal to cause the sensing location to provide the backscattered Rayleigh signal. The optical detection system can further include an optical detector comprising a single-photon detector (SPD) for detecting the backscattered Rayleigh signal received over the fiber optic cable. The optical detection system can further include circuitry to produce an acoustic signal representative of a downhole property based on the phase of the backscattered Rayleigh signal. Additional apparatuses, systems, and methods are disclosed.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: November 3, 2020
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Daniel Joshua Stark, John L. Maida, Casey Giron, David Andrew Barfoot
  • Patent number: 10819462
    Abstract: Systems and methods described herein measure quantum bit error rates in links between switches in a time-sensitive network, identify an increase in the quantum bit error rate in a monitored link of the links between the switches, and modify a configuration of the time-sensitive network so that secret information is not exchanged over the monitored link associated with the increase in the quantum bit error rate. The systems and methods optionally can direct computing devices to change or update the quantum key at a rate that is no slower than a rate at which the messages or frames are communicated between the computing devices. For example, a new portion of secret information used for secure communications can be created for each message and/or each frame that is communicated.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: October 27, 2020
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Stephen Francis Bush, Guillaume Mantelet
  • Patent number: 10812184
    Abstract: The present disclosure generally pertains to signal analysis systems and methods for measuring and characterizing signal attributes, such as noise. A signal analysis system comprises an optical receiver that receives an optical signal and converts the received signal into an electrical signal. A programmable frequency divider divides the frequency of the incoming electrical signal at different division ratios, and a signal analyzer analyzes the resulting signal. In this regard, by increasing the division ratio of the frequency divider and measuring the power spectral density with the signal analyzer at different division ratios, a suitable signal for determining different parameters (e.g., modulation frequency and modulation index) may be found.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: October 20, 2020
    Assignee: Board of Trustees of the University of Alabama, for and on behalf of the University of Alabama in Huntsville
    Inventors: Lingze Duan, Dipen K. Barot
  • Patent number: 10812881
    Abstract: A connection circuit arranged to connect at least one piece of electrical equipment (12) to an optical fiber (13) that might convey light signals of different wavelengths, the connection circuit comprising a wavelength multiplexer (16) having an upstream port (17) for connection to the optical fiber and a plurality of downstream ports (18, 19), a plurality of optical-electrical interfaces (24, 25) each compatible with at least one optical communication standard and each having both an optical port (26) connected to one of the downstream ports of the wavelength multiplexer and also an electrical port (27), an electrical processor component (35) having a communication port (36) via which the electrical processor component is arranged to emit and/or receive light signals (TXD, RXD), and a switch (45) arranged to connect the communication port of the electrical processor component selectively to an electrical port of one of the optical-electrical interfaces.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: October 20, 2020
    Assignee: SAGEMCOM BROADBAND SAS
    Inventors: Jean-Philippe Jaulin, Mikaël Hardy
  • Patent number: 10805075
    Abstract: Systems and associated methods of performing coherent optical communication of quantum information between an emitter A and a distant receiver B are provided, using a local local oscillator. Examples of LLO-based Continuous-Variable Quantum Key Distribution are described. Self-coherent schemes are used, the schemes consisting in deriving both signal and phase reference pulses from the same optical pulse thus ensuring an intrinsic strong signal to reference phase coherence. Different CV-QKD designs implementing various self-coherence phase sharing schemes are described and compared in terms of secret key rate and hardware requirements. Strong phase noise resilience can be obtained with standard telecom equipment such as low cost lasers.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: October 13, 2020
    Assignee: INSTITUT MINES-TELECOM
    Inventors: Romain Alleaume, Adrien Marie
  • Patent number: 10797869
    Abstract: Systems, apparatuses, methods, and computer program products are disclosed for session authentication. An example method includes receiving, by decoding circuitry and over a quantum line, a set of qbits generated based on a first set of quantum bases. The example method further includes decoding, by the decoding circuitry and based on a second set of quantum bases, the set of qbits to generate a decoded set of bits. The example method further includes generating, by session authentication circuitry, a session key based on the decoded set of bits.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: October 6, 2020
    Assignee: WELLS FARGO BANK, N.A.
    Inventor: Masoud Vakili
  • Patent number: 10778420
    Abstract: A quantum direct communication with user authentication and an apparatus using the same. The quantum direct communication method includes performing verification of security of a quantum channel using a preset channel verification probability and a quantum state source generated by a receiver of quantum direct communication, performing user authentication using one or more of a preset user authentication probability, the quantum state source, and an authentication key shared between the receiver and a sender, stopping quantum direct communication and resetting the quantum channel when the verification of security of the quantum channel fails, and stopping quantum direct communication when the user authentication fails.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: September 15, 2020
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Changho Hong, Nayoung Kim, Osung Kwon, Se Wan Ji, Haeng-Seok Ko, Jingak Jang, Daesung Kwon
  • Patent number: 10757570
    Abstract: A system and method for securing communications between a plurality of users communicating over an optical network. The system utilizes a fixed or tunable source optical generator to generate entangled photon pairs, distribute the photons and establish a key exchange between users. The distribution of entangled photon pairs is implemented via at least one wavelength selective switch.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: August 25, 2020
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Mikhail Brodsky, Mark David Feuer
  • Patent number: 10666462
    Abstract: Disclosed herein is a method of performing quantum channel estimation. The method is performed by a first device of a transmission device, and may include a first quantum state transmission step of transmitting a first quantum state ? including an N-qubit sequence to a second device of a reception device through a quantum channel, a second quantum state information reception step of receiving information about a second quantum state ?(?) received by the second device through the quantum channel from the second device, and a quantum channel estimation step of estimating the quantum channel based on the received information about the second quantum state ?(?).
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: May 26, 2020
    Assignee: University-Industry Cooperation Group of Kyung-Hee University
    Inventors: Hyundong Shin, Youngmin Jeong
  • Patent number: 10642628
    Abstract: Provided is a method for generating a device-specific identifier in a device which contains at least one programmable circuit component and the circuit of which consists of individual components that are configured by loading a bitstream, having the following method steps: displaying the reference identifier as a bit sequence and assigning each bit of the reference identifier to a respective different component of the circuit component; generating a reference bitstream for a reference circuit of the circuit component, the bitstream containing at least the specified component of the reference identifier; and entering the device specific identifier as a binary sequence by overwriting the bits of the corresponding components of the reference identifier directly in the reference bitstream.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: May 5, 2020
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Jens-Uwe Bußer, Dominik Merli
  • Patent number: 10633248
    Abstract: An apparatus includes a device having n input ports and n output ports. The n input ports are configured to receive n corresponding physical objects of a physically processed, quantum redundancy coded state. The n output ports are configured to output the n physical objects in the physically processed, quantum redundancy coded state. The device is configured to measure bits of a syndrome of the physically processed, quantum redundancy coded state by passing the n physical objects through the device. The device is configured to measure a parity check bit for the measured bits of the syndrome by the passing the n physical objects through the device.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: April 28, 2020
    Assignee: ALCATEL LUCENT
    Inventor: Alexei Ashikhmin
  • Patent number: 10630469
    Abstract: Disclosed herein are technologies regarding a communication device and server which are capable of cryptographic communication based on quantum cryptography. The communication device includes: a quantum signal generation unit configured to generate a series of first quantum signals by using a first quantum filter; an optical transmission unit configured to send the series of first quantum signals to a server; and a processor configured to select the first quantum filter based on a series of randomly generated first quantum states, and to control the quantum signal generation unit to generate the series of first quantum signals by using the first quantum filter.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: April 21, 2020
    Assignee: University of Seoul Industry Cooperation Foundation
    Inventor: Do Yeol Ahn
  • Patent number: 10601538
    Abstract: A fiber optic light intensity encryption method is provided. The method includes determining light intensities associated with multi-frequency light pulses emitted by a laser transmitter apparatus in response to an encryptions process. An encryption type for application of an encryption algorithm to each light intensity is determined and a first light intensity associated with a first light pulse is selected. Data indicating results of the random selection is transmitted to the laser transmitter apparatus and an initial security key is transmitted over a signaling channel of the laser transmitter apparatus. The signaling channel is secured based on the initial security key resulting in a secure signaling channel. In response, a secure bundle comprising said the secure signaling channel and an additional group of channels is generated and the data is transmitted via the secure bundle.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: March 24, 2020
    Assignee: International Business Machines Corporation
    Inventors: Ricardo A. Golcher Ugalde, Franz F. Liebinger Portela, Meller J. Perez Nunez
  • Patent number: 10581599
    Abstract: A cloud storage method and a cloud storage system are provided. The method includes: generating, by a QKD system on a terminal side and a QKD system on at least one cloud server side, at least one quantum key over a quantum network; sending, by the QKD system, the at least one quantum key to the key management terminal for storage; and obtaining, by a cloud storage client, the at least one quantum key from the key management terminal, and processing the at least one quantum key to generate a combined key by a predetermined encryption algorithm.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: March 3, 2020
    Assignee: QUANTUMCTEK CO., LTD
    Inventors: Yong Zhao, Meisheng Zhao, Hongyu Wu
  • Patent number: 10574461
    Abstract: Message authenticators for quantum-secured communications facilitate low-latency authentication with assurances of security. Low-latency message authenticators are especially valuable in infrastructure systems where security and latency constraints are difficult to satisfy with conventional non-quantum cryptography. For example, a message transmitter receives a message and derives an authentication tag for the message based at least in part on an authenticator that uses one or more quantum keys. The message transmitter outputs the message and its authentication tag. A message receiver receives a message and authentication tag for the message. The message receiver derives a comparison tag for the message based at least in part on an authenticator that uses one or more quantum keys. The message receiver checks whether the message is authentic based on a comparison of the authentication tag and the comparison tag. In example implementations, the authenticator uses stream-wise cyclic redundancy code operations.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: February 25, 2020
    Assignee: Triad National Security, LLC
    Inventors: Richard John Hughes, Jane Elizabeth Nordholt, Charles Glen Peterson, Kush T. Tyagi, Christopher C. Wipf, Raymond Thorson Newell, Kevin P. McCabe, Nicholas Dallmann
  • Patent number: 10574364
    Abstract: Embodiments of this application disclose a quantum signal detection method and a quantum signal detection apparatus. The method includes: splitting a received optical pulse sequence into a first pulse sequence and a second pulse sequence that are in orthogonal polarization, where the signal pulses are quantum signal pulses; obtaining information about the reference pulses; generating local oscillator light; splitting the local oscillator light into first local oscillator light and second local oscillator light whose intensities are the same and that are in orthogonal polarization; performing homodyne detection on the first pulse sequence and the first local oscillator light, and performing homodyne detection on the second pulse sequence and the second local oscillator light, to obtain homodyne detection results; and obtaining regular components of the signal pulses in the optical pulse sequence according to the homodyne detection results and the information about the reference pulses.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: February 25, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Changzheng Su, Yang Zou
  • Patent number: 10541809
    Abstract: There is provided an integrated-optic transmitter for transmitting light pulses to a further optical apparatus for generating a quantum cryptographic key according to at least one quantum cryptography technique. There is also provided an integrated-optic receiver for generating a quantum cryptographic key from light pulses received from a further optical apparatus. The transmitter apparatus splits incoming light into two paths to temporally separate the split light pulses and controls the output intensity of each split pulse as well as the phase of at least one of the split pulses. The receiver apparatus receives first and second light pulses and controls the output intensity of each said pulse between a first and a second optical detector. The light input into the second detector passes through an integrated element that controls the amount of light output into two paths that recombine before at least a portion is output to the second detector.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: January 21, 2020
    Assignee: The University of Bristol
    Inventors: Mark Godfrey, Mark Thompson, Philip Sibson
  • Patent number: 10511629
    Abstract: Methods and systems for encryption control in optical networks without data loss enable various transitions related to encryption of an ODU data payload. A transition from unencrypted data payload to encrypted data payload is performed without data loss or dropping of OTN frames. A transition from encrypted data payload to unencrypted data payload is performed without data loss or dropping of OTN frames. A rotation of the encryption key to another encryption key is also performed without data loss or dropping of OTN frames.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: December 17, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Muhammad Sakhi Sarwar, Erik Charles Stewart, Junichi Sugiyama, Abirami Sathyamoorthy, Swati Mittal
  • Patent number: 10511437
    Abstract: Quantum key distribution device includes a transmitter, including a light source, a first polarization controller, a phase modulator and an optical attenuator, all connected in series using a first optical fiber; a receiver, including a second polarization controller, a second phase modulator, a third polarization controller, a beamsplitter, and two single photon detectors, all connected in series using a second optical fiber; and a communication channel providing a light path from the transmitter to the receiver. The first and/or second optical fiber is a polarization maintaining fiber. The first and second phase modulators are actively controlled Pockels cell crystals, lithium niobate crystals or gallium arsenide crystals. The polarization controllers include a piezo-driven fiber compression device, a Pockels cell controller, a piezo-driven fiber twist device, or a non-linear optical crystal. The first and third polarization controllers use a ?/2 plate, or 45° fiber splice polarizer.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: December 17, 2019
    Assignee: International Center for Quantum Optics & Quantum Technologies LLC
    Inventors: Vasily Yevgenyevich Ustimchik, Alexander Valerievich Duplinsky, Yury Vladimirovich Kurochkin, Vladimir Leonidovich Kurochkin, Alan Alexandrovich Kanapin
  • Patent number: 10498463
    Abstract: A system for powering a network element of a fiber optic wide area network is disclosed. When communication data is transferred between a central office (CO) and a subscriber terminal using a network element to convert optical to electrical (O-E) and electrical to optical (E-O) signals between a fiber from the central office and twisted wire pair, coaxial cable or Ethernet cable transmission lines from the subscriber terminal, techniques related to local powering of a network element or drop site by the subscriber terminal or subscriber premise remote powering device are provided. Certain advantages and/or benefits are achieved using the present invention, such as freedom from any requirement for additional meter installations or meter connection charges and does not require a separate power network.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: December 3, 2019
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 10491383
    Abstract: One embodiment provide a system and method for detecting eavesdropping while establishing secure communication between a local node and a remote node. During operation, the local node generates a random key and a regular optical signal based on the random key. The local node also generates a quantum optical signal based on a control sequence and a set of quantum state bases, and multiplexes the regular optical signal and the quantum optical signal to produce a hybrid optical signal. The local node transmits the hybrid optical signal to the remote node, sends information associated with the control sequence and information associated with the set of quantum state bases to the remote node, and receives an eavesdropping-detection result from the remote node based on measurement of the quantum optical signal, the information associated with the control sequence, and the information associated with the set of quantum state bases.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: November 26, 2019
    Assignee: Alibaba Group Holding Limited
    Inventors: Yingfang Fu, Shuanlin Liu
  • Patent number: 10447472
    Abstract: Systems and method for applying security measures to data sets requiring external quantum-level processing. Specifically, segmenting a data set into a plurality of data blocks/segments, such that each data block is communicated to different external entities for subsequent quantum-level computing processing of the data blocks. Once the data blocks have been quantum-level processed by the external entities and returned to the data provider/owner, the data blocks are combined to re-form the data set.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: October 15, 2019
    Assignee: BANK OF AMERICA CORPORATION
    Inventor: Manu Jacob Kurian
  • Patent number: 10432396
    Abstract: An identity authentication method for a quantum key distribution process includes selecting, by a sender, preparation bases of an identity authentication bit string in accordance with a preset basis vector selection rule; sending, by a sender, quantum states of the identity authentication bit string and quantum states of a randomly generated key bit string by using different wavelengths. The identity authentication bit string is interleaved in the key bit string at a random position and with a random length.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: October 1, 2019
    Assignee: ALIBABA GROUP HOLDING LIMITED
    Inventors: Yingfang Fu, Shuanlin Liu
  • Patent number: 10396986
    Abstract: A method for generating a shared secret between a first user and a second user of a network is provided. The first user receives from the second user a first training sequence via a communication link between the first user and the second user. The first user ascertains at least one first value for at least one physical property of the communication link, and determines a portion of the shared secret as a function of the first value. A comparison of the first value to at least one threshold takes place for determining the portion of the shared secret. The first user transmits the first training sequence to the second user via the communication link, and adapts the transmission parameters of the first training sequence as a function of the position of the first value relative to the threshold.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: August 27, 2019
    Assignee: Robert Bosch GmbH
    Inventor: Stephan Ludwig
  • Patent number: 10382141
    Abstract: A communication linker includes: a classical encoder; an optical transmitter; a receiver; a local oscillator in communication with the receiver and that: receives a feedback signal; and produces a displacement frequency, based on the feedback signal; a single photon detector in communication with the receiver and that: receives an optical signal from the receiver; and produces a single photon detector signal, based on the optical signal; a signal processor in communication with the single photon detector and that: receives the single photon detector signal from the single photon detector; produces the feedback signal, based on the single photon detector signal; and produces a decoded signal, based on the single photon detector signal, the decoded signal comprising a frequency of the feedback signal.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: August 13, 2019
    Assignee: THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
    Inventors: Sergey V. Polyakov, Ivan Burenkov
  • Patent number: 10356054
    Abstract: A method for establishing a fully private, information theoretically secure interconnection between a source and a destination, over an unmanaged data network with at least a portion of a public infrastructure. Accordingly, n shares of the source data are created at the source according to a predetermined secret sharing scheme and the shares are sent to the data network, while encrypting the sent data using (n,k) secret sharing. A plurality of intermediating nodes are deployed in different locations over the network, to create a plurality of fully and/or partially independent paths in different directions on the path from the source to the destination, and with sufficient data separation. Then, the shares are sent over the plurality of fully and/or partially independent paths while forcing shares' carrying packets to pass through selected intermediate nodes, such that no router at any intermediating nodes intercepts k or more shares.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: July 16, 2019
    Assignee: SECRET DOUBLE OCTOPUS LTD
    Inventors: Shlomi Dolev, Shimrit Tzur-David
  • Patent number: 10355857
    Abstract: A hardware system and encryption method that generates encryption keys based on quantum mechanical phenomena that can be delivered directly, over public wired and wireless channels, to communicating devices. The encryption strength is derived from physical phenomena and not mathematical complexity and, therefore, is “future proof” against advances in computational power. The present invention allows pre-existing networked devices to communicate securely within a geographically defined “protection zone.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: July 16, 2019
    Assignee: QUBITEKK, INC.
    Inventor: Dennis Duncan Earl
  • Patent number: 10341096
    Abstract: Various technologies for performing discrete-variable (DV) quantum key distribution (QKD) with integrated electro-optical circuits are described herein. An integrated DV-QKD system uses Mach-Zehnder modulators (MZMs) to modulate a polarization of photons at a transmitter and select a photon polarization measurement basis at a receiver. A transmitter of a DV-QKD system further uses phase shifters to correct for non-idealities of the MZM in output provided to a polarization beam splitter. A receiver of a DV-QKD system can use phase shifters between a polarization beam splitter and an MZM to correct for non-idealities of the polarization beam splitter and the MZM on the receiver side.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: July 2, 2019
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Anthony L. Lentine, Christopher DeRose, Paul Davids, Hong Cai
  • Patent number: 10313114
    Abstract: An authentication method for a QKD process includes: a sender selects a basis for preparing authentication information according to an algorithm in an algorithms library, and respectively applies different wavelengths to send quantum states of control information and data information according to a preset information format; a receiver filters the received quantum states, employs a basis of measurement corresponding to the algorithm to measure the authentication information quantum state, sends reverse authentication information when the measurement result is in line with the algorithm, and terminates the distribution process otherwise. In addition, the sender terminates the distribution process when its local authentication information is inconsistent with the reverse authentication information.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: June 4, 2019
    Assignee: Alibaba Group Holding Limited
    Inventor: Yingfang Fu
  • Patent number: 10313113
    Abstract: In a quantum communication system, each transmitter unit has a source of quantum signals. A receiver unit has a quantum receiver with at least one detector configured to detect quantum signals; a first classical communication device; and a passive optical splitter. The transmitter units are optically coupled to the receiver unit through the passive optical splitter. The passive optical splitter is optically coupled to the quantum receiver through a first spatial channel and optically coupled to the first classical communication device through a second spatial channel. The first spatial channel and second spatial channel are separate spatial channels. The passive optical splitter is configured to distribute an inputted optical signal irrespective of its wavelength.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: June 4, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Bernd Matthias Frohlich, Zhiliang Yuan, Andrew James Shields
  • Patent number: 10305688
    Abstract: A cloud-based encryption machine key injection system includes at least one key injection sub-system including a key generation device and a quantum key distribution device connected with the key generation device, and a cloud-based encryption machine hosting sub-system including an encryption machine carrying a virtual encryption device and a quantum key distribution device connected with the encryption machine. The key injection sub-system and the encryption machine hosting sub-system are connected with each other through their respective quantum key distribution devices. The key generation device may generate a root key component of the virtual encryption device and transmit the root key component to the encryption machine. The encryption machine may receive root key components from one or more key generation devices and synthesize a root key of the virtual encryption device in accordance with the received root key components.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: May 28, 2019
    Assignee: ALIBABA GROUP HOLDING LIMITED
    Inventors: Yingfang Fu, Shuanlin Liu
  • Patent number: 10305687
    Abstract: A method is provided for a verifying system to verify a location of a target apparatus. The method comprises transmitting a plurality of signals from two or more of a plurality of communication devices of the verifying system to the target apparatus, each signal of the plurality of signals comprising information. The method further comprises sending quantum information to the target apparatus via a quantum communication channel, wherein a plurality of bits is encoded in the quantum information and the encoding of the plurality of bits is based on an output of a function of the information associated with the plurality of signals. The method further comprises receiving a response related to the plurality of bits at two or more of the plurality of communication devices. The method further comprises analyzing the response, the plurality of bits encoded in the quantum information, and a time between the transmitting of the plurality of signals and the receiving of the response.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: May 28, 2019
    Assignee: QUBALT GMBH
    Inventor: Dominique Unruh
  • Patent number: 10291399
    Abstract: Quantum secure communication systems communicate quantum signals for quantum key distribution and classical signals with encrypted data and commands via a single optical fiber. In some systems, the single fiber carries classical data in both directions along with quantum communications. For example, quantum keys can be used to encrypt packets for bidirectional communication between two parties. In other systems, a single fiber is used for one way classical communications and quantum communications. The communication systems are secured using a security parameter based on the quantum and classical communications across the optical fiber.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: May 14, 2019
    Assignee: Traid National Security, LLC
    Inventors: Jane Elizabeth Nordholt, Richard John Hughes, Charles Glen Peterson, Raymond Thorson Newell
  • Patent number: 10225732
    Abstract: A system and method for securing communications between a plurality of users communicating over an optical network. The system utilizes a fixed or tunable source optical generator to generate entangled photon pairs, distribute the photons and establish a key exchange between users. The distribution of entangled photon pairs is implemented via at least one wavelength selective switch.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: March 5, 2019
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Mikhail Brodsky, Mark David Feuer
  • Patent number: 10223182
    Abstract: According to an embodiment, a communication device is connected with external devices by quantum communication channels and a classical communication channel, and generates an encryption key with photons exchanged over the quantum communication channel. The communication device includes an acquirer, a calculator, a selector, and a communicating unit. The acquirer is configured to acquire a quantum error rate for each quantum communication channel. The calculator is configured to calculate a metric of a first path to each external device based on the quantum error rate. The selector is configured to select a second path in the classical communication channel to a specific one of the external devices based on the metric. The communicating unit is configured to transmit an application key to the specific one of the external devices over the second path.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: March 5, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Ririka Takahashi
  • Patent number: 10171237
    Abstract: The invention relates to quantum cryptography, and includes a communication system for transmitting a cryptographic key between the ends of a channel, including a transmitting node (Alice) comprising a beam splitter, an electro-optical attenuator, an amplitude modulator, a phase modulator, a storage line, a Faraday mirror, a synchronization detector; a receiving node (Bob) that includes avalanche photodiodes, a beam splitter, a circulator, a delay line, a phase modulator, a polarizing beam splitter, a Mach-Zehnder interferometer, and also a quantum channel for connecting these nodes. In this case, for the storage line is placed between the electro-optical phase modulator of the sender and the Faraday mirror. The limiting frequency of the laser pulse repetition at a fixed value of their width is increased, which makes it possible to use an autocompensation circuit at a frequency corresponding to the width of the laser pulse, which is the maximum possible result.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: January 1, 2019
    Assignee: Inernational Center for Quantum Optics & Quantum Technologies LLC
    Inventors: Alexandr Valerievich Duplinskiy, Vasily Evgenyevich Ustimchik, Yuri Vladimirovich Kurochkin, Vladimir Leonidovich Kurochkin, Alexander Vitalievich Miller
  • Patent number: 10129021
    Abstract: A photon pair generator includes a light source configured to emit light, and a nonlinear optical element configured to receive the light radiated from the light source and generate a quantum-entangled photon pair through spontaneous parametric down-conversion (SPDC), the nonlinear optical element including a polar material layer and a nonlinear material layer provided on the polar material layer.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: November 13, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Heejeong Jeong, Jisoo Kyoung, Changwon Lee, Chanwook Baik, Yeryoung Lee
  • Patent number: 10110322
    Abstract: A secure communication system utilizes multiple “decoy” data signals to hide one or more true data signals. The true data signal(s) are encrypted, and received at a scrambling unit according to an original set of channel assignments. The channel assignments are optically switched with multiple decoy data signals to form a multi-channel “scrambled” output signal that is thereafter transmitted across a communication system. The greater the number of decoy signals, the greater the security provided to the open-air system. Further security may be provided by encrypting the decoy signals prior to scrambling and/or by utilizing a spatially diverse set of transmitters and receivers. Without the knowledge of the channel assignment(s) for the true signal(s), an eavesdropper may be able to intercept (and, with time, perhaps descramble) the open-air transmitted signals, will not be able to distinguish the true data from the decoys without also knowing the channel assignment(s).
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: October 23, 2018
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: David M. Britz, Robert Raymond Miller, II, Nemmara K. Shankaranarayanan
  • Patent number: 10079677
    Abstract: Techniques are disclosed relating to relating to a public key infrastructure (PKI). In one embodiment, an integrated circuit is disclosed that includes at least one processor and a secure circuit isolated from access by the processor except through a mailbox mechanism. The secure circuit is configured to generate a key pair having a public key and a private key, and to issue, to a certificate authority (CA), a certificate signing request (CSR) for a certificate corresponding to the key pair. In some embodiments, the secure circuit may be configured to receive, via the mailbox mechanism, a first request from an application executing on the processor to issue a certificate to the application. The secure circuit may also be configured to perform, in response to a second request, a cryptographic operation using a public key circuit included in the secure circuit.
    Type: Grant
    Filed: June 4, 2016
    Date of Patent: September 18, 2018
    Inventors: Wade Benson, Libor Sykora, Vratislav Kuzela, Michael Brouwer, Andrew R. Whalley, Jerrold V. Hauck, David Finkelstein, Thomas Mensch
  • Patent number: 10038554
    Abstract: An identity authentication method for a quantum key distribution process includes selecting, by a sender, preparation bases of an identity authentication bit string in accordance with a preset basis vector selection rule; sending, by a sender, quantum states of the identity authentication bit string and quantum states of a randomly generated key bit string by using different wavelengths. The identity authentication bit string is interleaved in the key bit string at a random position and with a random length.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: July 31, 2018
    Assignee: ALIBABA GROUP HOLDING LIMITED
    Inventors: Yingfang Fu, Shuanlin Liu
  • Patent number: 10020937
    Abstract: An apparatus and method for revealing both attack attempts performed on the single-photon detector(s) of a quantum cryptography system and Trojan horse attack attempts performed on quantum cryptography apparatus containing at least one single photon detector. The attacks detection relies on both the random modification of the setting parameters of the said single-photon detector(s) and the comparison of the measured detection probability values for each setting parameter with the expected detection probability values. The modified parameter of the single-photon detector can be its efficiency or its timing of activation for example.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: July 10, 2018
    Assignee: ID Quantique SA
    Inventors: Matthieu Legre, Grégorie Ribordy
  • Patent number: 9998255
    Abstract: A fiber optic light intensity encryption method is provided. The method includes determining light intensities associated with multi-frequency light pulses emitted by a laser transmitter apparatus in response to an encryptions process. An encryption type for application of an encryption algorithm to each light intensity is determined and a first light intensity associated with a first light pulse is selected. Data indicating results of the random selection is transmitted to the laser transmitter apparatus and an initial security key is transmitted over a signaling channel of the laser transmitter apparatus. The signaling channel is secured based on the initial security key resulting in a secure signaling channel. In response, a secure bundle comprising said the secure signaling channel and an additional group of channels is generated and the data is transmitted via the secure bundle.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Ricardo A. Golcher Ugalde, Franz F. Liebinger Portela, Meller J. Perez Nunez
  • Patent number: 9921593
    Abstract: The present disclosure provides a detailed description of techniques for implementing a wideband low dropout voltage regulator with power supply rejection boost. More specifically, some embodiments of the present disclosure are directed to a voltage regulator comprising a voltage regulator core powered by a supply voltage and providing a regulated voltage output, and a power supply feed forward injection module delivering an injection signal to the voltage regulator core to effect a power supply rejection of the supply voltage variation from the regulated voltage. In one or more embodiments, the injection signal is determined from the supply voltage variation and a gain factor that is based on various design attributes of the output stage of the voltage regulator core. In one or more embodiments, the power supply feed forward injection module comprises a supply voltage sense circuit, a low pass filter, and one or more selectable transconductance amplifiers.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: March 20, 2018
    Assignee: INPHI CORPORATION
    Inventors: James Lawrence Gorecki, Han-Yuan Tan