Patents Assigned to MagiQ Technologies, Inc.
  • Patent number: 9581448
    Abstract: A method for enhancing a sensitivity of an optical sensor having an optical cavity counter-propagates beams of pump light within the optical cavity to produce scattered light based on Stimulated Brillouin Scattering (SBS). The properties of the pump light are selected to generate fast-light conditions for the scattered light, such that the scattered light includes counter-propagating beams of fast light. The method prevents the pump light from resonating within the optical cavity, while allowing the scattered light to resonate within the optical cavity. At least portions of the scattered light are interfered outside of the optical cavity to produce a beat note for a measurement of the optical sensor. The disclosed method is particularly applicable to optical gyroscopes.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: February 28, 2017
    Assignee: MagiQ Technologies, Inc.
    Inventors: Caleb A Christensen, Anton Zavriyev
  • Patent number: 9506739
    Abstract: A method determines a distance with a specified accuracy. The method transmits to an interferometer a test signal oscillating with a test frequency and receives, in response to the transmitting, an interferometric signal formed by interfering the test signal with a delayed signal produced by delaying a copy of the test signal over the distance equal to a path length difference in the interferometer. The test frequency is varying such that the test signal oscillates with different values of the test frequency. The method determines at least two values of the test frequency corresponding to particular values of the interferometric signal by beating the test signal with a reference signal having a reference frequency, wherein a value of the reference frequency is an absolute value predetermined with the specified accuracy. The method determines the distance using the two values of the test frequency.
    Type: Grant
    Filed: December 21, 2013
    Date of Patent: November 29, 2016
    Assignee: MagiQ Technologies, Inc.
    Inventors: Caleb A Christensen, Anton Zavriyev, A. Craig Beal
  • Patent number: 8340298
    Abstract: Key management and user authentication systems and methods for quantum cryptography networks that allow for users securely communicate over a traditional communication link (TC-link). The method includes securely linking a centralized quantum key certificate authority (QKCA) to each network user via respective secure quantum links or “Q-links” that encrypt and decrypt data based on quantum keys (“Q-keys”). When two users (Alice and Bob) wish to communicate, the QKCA sends a set of true random bits (R) to each user over the respective Q-links. They then use R as a key to encode and decode data they send to each other over the TC-link.
    Type: Grant
    Filed: April 16, 2007
    Date of Patent: December 25, 2012
    Assignee: MagiQ Technologies, Inc.
    Inventors: Robert Gelfond, Audrius Berzanskis
  • Patent number: 8233631
    Abstract: A medical voice data system includes a hand-held recording device, an electronic information carrier (EIC), and a host station. The hand-held device records medical information from a user that is examining a person in an extreme environment such as battlefield or disaster area. EICs are stored within a housing interior and can be dispensed therefrom by the user. Recording electronics within the housing interior are operably connected to at least one of the EICs. A microphone is operably connected to the recording electronics to record on a EIC medical information about the injured person. The EIC is configured to be attached to and travel with the person as they are evacuated so that the recorded medical information is immediately available to medical personnel at a care center via the host station. The medical voice data system may also employ a wireless EIC. A host station is used to receive and process the recorded information and convert it to text-based medical record.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: July 31, 2012
    Assignee: MagiQ Technologies, Inc.
    Inventor: Audrius Berzanskis
  • Patent number: 8098826
    Abstract: A method of autocalibrating the timing of the laser in a quantum key distribution (QKD) system is disclosed. The laser generates photon signals in response to a laser gating signals from a controller. The method includes first performing a laser gate scan to establish the optimum laser gating signal arrival time corresponding to an optimum bit-error rate when exchanging photon signals between encoding stations of the QKD system. Once the optimum laser gating signal arrival time is determined, the laser gate scan is terminated and laser gate dithering is initiated. Laser gate dithering involves varying the arrival time of the laser gating signal around the optimum value of the arrival time. Laser gate dithering provides minor adjustments to the laser gating signal arrival time to ensure that the system operates at or near the optimum bit-error rate.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: January 17, 2012
    Assignee: MagiQ Technologies, Inc.
    Inventor: Jonathan Young
  • Patent number: 8073336
    Abstract: Entanglement-based QKD systems and methods with active phase tracking and stabilization are disclosed wherein pairs of coherent photons at a first wavelength are generated. Second harmonic generation and spontaneous parametric downconversion are used to generate from the pairs of coherent photons entangled pairs of photons having the first wavelength. Relative phase delays of the entangled photons are tracked using reference optical signals. Classical detectors detect the reference signals while single-photon detectors and a control unit generate a phase-correction signal that maintains the relative phases of phase-delay loops via adjustable phase-delay elements.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: December 6, 2011
    Assignee: MagiQ Technologies, Inc.
    Inventor: Alexei Trifonov
  • Patent number: 8068741
    Abstract: The invention provides an apparatus and method for time delaying different polarization components of a signal relative to one another, comprising a polarization signal splitter which splits first and second polarization components of an input signal into a first component signal and a second component signal such that said first component signal propagates along a first path and the second component signal propagates along a second path, wherein said first component signal reaches a location relative to when said second component reaches said location at times differing by a delayed time, and use of the apparatus in a communication system. The apparatus may be used for quantum cryptography, to convert a sender's polarization-qubit signal into a signal appropriate for channels and receivers based on phase-encoded schemes.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: November 29, 2011
    Assignee: Magiq Technologies, Inc.
    Inventor: Norbert Lutkenhaus
  • Patent number: 8059964
    Abstract: A QKD system (10) having two QKD stations (Alice and Bob) optically coupled by an optical fiber link (FL), wherein Bob includes a variable timing delay arranged between Bob's controller (CB) and modulator (MB) or detector unit (40). A set-up and calibration procedure is performed wherein delay DL2 is adjusted until the timings for the modulator and detector unit (TSB and TS42, respectively) are established. Delay DL2 is then fixed so that the detector unit and modulator operate in a common timing mode that is not changed if the synchronization signal is changed. The timing TSS of the synchronization (sync) signals (SS) sent from Alice to Bob is adjusted to arrive at optimum system performance. Once the QKD system is in operation, because the sync signal can drift, the sync signal timing TSS is dithered maintain optimum QKD system performance.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: November 15, 2011
    Assignee: MagiQ Technologies, Inc.
    Inventor: Harry Vig
  • Patent number: 7899092
    Abstract: Apparatus and methods of performing fast single-qubit quantum gates using ultrafast femtosecond frequency chirped laser pulses are disclosed. The use of chirped pulses removes the demanding restrictions of prior art approaches and allows for the construction of fast quantum gates that operate at speeds on the of order several picoseconds. The apparatus includes two synchronized lasers (pump and Stokes) used to manipulate a qubit wave function in a select manner. Each laser system generates a train of optical pulses. Pulse pickers choose pump and Stokes pulses, which propagate though respective pulse shapers that apply necessary time-dependent phases. To achieve complete overlap between the pulses in time domain, necessary adjustments can be made by using an additional time delay line, which can be located in any path or in both paths.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: March 1, 2011
    Assignee: MagiQ Technologies, Inc.
    Inventor: Vladimir Malinovsky
  • Patent number: 7859744
    Abstract: A robust, quickly tunable narrow-linewidth entangled photon source system based on Spontaneous Parametric Down Conversion (SPDC) of the pump light in periodically polled LiNbO3 (PPLN) waveguides. The photon source provides narrow-linewidth, entangled output photons having a wavelength in the telecom C-Band wavelength. To tailor the output spectrum of the output photons, the PPLN waveguide is arranged between two end waveguides having LiNbO3-embedded Bragg gratings, thereby forming a tunable Fabry-Perot cavity. The resulting narrow output linewidth of the output photons makes the system desirable for use in a long-distance quantum key distribution (QKD) system.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: December 28, 2010
    Assignee: MagiQ Technologies, Inc.
    Inventor: Alexel Trifonov
  • Patent number: 7809143
    Abstract: Systems and methods for verifying error-free transmission of the synchronization (“sync”) channel of a QKD system are disclosed. The method includes sending a first pseudo-random bit stream (PRBS) over the sync channel from Alice to Bob, and verifying at Bob the accurate transmission of the first PRBS. The method also includes sending a second pseudo-random bit stream (PRBS) over the sync channel from Bob to Alice, and verifying at Alice the accurate transmission of the first PRBS. If the transmissions of a select number of bits in the first and second PRBSs are error-free, then the sync channel is verified and the QKD system can commence operation.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: October 5, 2010
    Assignee: Magiq Technologies, Inc.
    Inventors: Jonathan Young, Harry Vig, J. Howell Mitchell, Jr.
  • Patent number: 7809269
    Abstract: Systems and methods for multiplexing two or more channels of a quantum key distribution (QKD) system are disclosed. A method includes putting the optical public channel signal (SP1) in return-to-zero (RZ) format in a transmitter (T) in one QKD station (Alice) and amplifying this signal (thereby forming SP1*) just prior to this signal being detected with a detector (30) in a receiver (R) at the other QKD station (Bob). The method further includes precisely gating the detector via a gating element (40) and a coincident signal (PN1?) with pulses that coincide with the expected arrival times of the pulses in the detected (electrical) public channel signal (SP2). This allows for the public channel signal to have much less power, making it more amenable for multiplexing with the other QKD signals.
    Type: Grant
    Filed: August 23, 2005
    Date of Patent: October 5, 2010
    Assignee: MagiQ Technologies, Inc.
    Inventors: J. Howell Mitchell, Harry Vig
  • Patent number: 7787625
    Abstract: A quantum key distribution (QKD) cascaded network with loop-back capability is disclosed. The QKD system network includes a plurality of cascaded QKD relays each having two QKD stations Alice and Bob. Each QKD relay also includes an optical switch optically coupled to each QKD station in the relay, as well as to input ports of the relay. In a first position, the optical switch allows for communication between adjacent relays and in a second position allows for pass-through communication between the QKD relays that are adjacent the relay whose switch is in the first position.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: August 31, 2010
    Assignee: MagiQ Technologies, Inc.
    Inventors: Harry Vig, Audrius Berzanskis
  • Patent number: 7781754
    Abstract: The Bell-state analyzer includes a semiconductor device having quantum dots formed therein and adapted to support Fermions in a spin-up and/or spin-down states. Different Zeeman splittings in one or more of the quantum dots allows resonant quantum tunneling only for antiparallel spin states. This converts spin parity into charge information via a projective measurement. The measurement of spin parity allows for the determination of part of the states of the Fermions, which provides the states of the qubits, while keeping the undetermined part of the state coherent. The ability to know the parity of qubit states allows for logic operations to be performed on the qubits, i.e., allows for the formation of (two-qubit) quantum gates, which like classical logic gates, are the building blocks of a quantum computer. Quantum computers that perform a parity gate and a CNOT gate using the Bell-state analyzer of the invention are disclosed.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: August 24, 2010
    Assignee: MagiQ Technologies, Inc.
    Inventors: Daniel Loss, Hans-Andreas Engel
  • Patent number: 7720228
    Abstract: Methods for calibrating the modulators in a QKD system (100) are disclosed. The methods include setting the voltage (VB) of Bob's modulator (MB) to a positive value and then adjusting the voltage (VA) of Alice's modulator (MA) in both the positive and negative direction to obtain overall relative phase modulations that result in maximum and minimum photon counts (N) in the two single-photon detectors (32a, 32b). Bob's modulator voltage is then set to a negative value and the process repeated. When the basis voltages (VB(1), VB(2), VA(1), VA(2), VA(3) and VA(4)) are established, the QKD system is operated with intentionally selected incorrect bases at Bob and Alice to assess orthogonality of the basis voltages by assessing whether or not the probability of photon detection at the detectors is 50:50. If not, the modulator voltages are adjusted to be orthogonal. This involves changing Bob's basis voltage (VB(1) and/or VB(2)) and repeating the process until a 50:50 detector count distribution is obtained.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: May 18, 2010
    Assignee: MagiQ Technologies, Inc
    Inventors: Anton Zavriyev, Harry Vig
  • Patent number: 7702106
    Abstract: Systems and methods for quantum secret splitting based on non-orthogonal multi-particle states are disclosed. The method includes preparing at a sender (“Charlie”) two qubits each of which can be in one of two non-orthogonal states and distributing the qubits to respective parties Alice and Bob. The method also includes measuring at Alice the state of the qubit she receives by a projective measurement so that the measurement result is either 0 or 1, and at Bob measuring the state of the qubit he receives such that the measurement result is either 0, 1 or f, wherein f represents a failure by Bob to properly measure the qubit state. The method also includes communicating between Alice, Bob and Charlie the outcome of their respective measurements so as to deduce the state of the qubits sent to Alice and Bob.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: April 20, 2010
    Assignee: MagiQ Technologies, Inc.
    Inventors: Jihane Mimih, Mark Hillery, Ekaterina Rogacheva
  • Patent number: 7646873
    Abstract: Key manager systems and methods for a QKD-based network are disclosed. The system includes a QKD layer that generates quantum encryption keys, a persistent storage layer that stores the quantum encryption keys, and a key management layer. The key management layer generates an application registration record that includes a list of multiple applications that use the quantum encryption keys. The key management layer also generates a corresponding key storage layer. The multiple applications reside in an applications layer. The applications in each node remove keys from the key storage layer so that each node can encrypt/decrypt data using quantum encryption keys. The methods also include secure QKD system boot-up and authentication that facilitate implementing a commercial QKD system in real-world environments.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: January 12, 2010
    Assignee: Magiq Technologies, Inc.
    Inventors: Keun M. Lee, Andrlus Berzanskis
  • Patent number: 7620182
    Abstract: A method for enhancing the security of a quantum key distribution (QKD) system having QKD stations Alice and Bob. The method includes encrypting key bits generated by a true random number generator (TRNG) and sent to a polarization or phase modulator to encode weak optical pulses as qubits to be shared between Alice and Bob. Key bit encryption is achieved by using a shared password and a stream cipher. Bob obtains at least a subset of the original key bits used by Alice by utilizing the same stream cipher and the shared password.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: November 17, 2009
    Assignee: MagiQ Technologies, Inc.
    Inventors: Audrius Berzanskis, Jonathan Young
  • Patent number: 7606371
    Abstract: A two-way actively stabilized QKD system that utilizes control signals and quantum signals is disclosed. Because the quantum signals do not traverse the same optical path through the system, signal collisions in the phase modulator are avoided. This allows the system to have a higher transmission rate than a two-way system in which the quantum signals traverse the same optical path. Also, the active stabilization process, which is based on maintaining a fixed relationship between an intensity ratio of interfered control signals, is greatly simplified by having the interferometer loops located all in one QKD station.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: October 20, 2009
    Assignee: MagiQ Technologies, Inc.
    Inventors: Anton Zavriyev, Alexei Trifonov, Michael LaGasse
  • Patent number: 7602919
    Abstract: A method of integrating quantum key distribution (QKD) with Internet protocol security (IPSec) to improve the security of IPSec. Standard IPSec protocols impose limits on the frequency at which keys can be changed. This makes efforts to improve the security of IPSec by employing quantum keys problematic. The method includes employing multiple security associations (SA) in in-bound and outbound SA Tables in a manner that enables a high key flipping rate and that enables combining quantum keys with classical keys generated by Internet Key Exchange (IKE), thereby enabling QKD-based IPSec.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: October 13, 2009
    Assignee: MagiQ Technologies, Inc
    Inventors: Audrius Berzanskis, Harri Hakkarainen, Keun Lee, Muhammad Raghib Hussain