Patents by Inventor Timothy Spiller

Timothy Spiller has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8781334
    Abstract: An iterative method is provided for progressively building an end-to-end entanglement between qubits in first and second end nodes (91, 92) of a chain of nodes whose intermediate nodes (90) are quantum repeaters. At each iteration, a current operative repeater (90) of the chain merges an entanglement existing between qubits in the first end node (91) and the operative repeater, with a local entanglement formed between qubits in the operative repeater and its neighbor node towards the second end node (92). For the first iteration, the operative repeater is the neighbor of the first end node (91); thereafter, for each new iteration the operative repeater shifts one node further along the chain toward the second end node (92). A quantum repeater adapted for implementing this method is also provided.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: July 15, 2014
    Inventors: William Munro, Keith Harrison, Timothy Spiller, Kae Nemoto
  • Patent number: 8774638
    Abstract: A handheld device includes: a transmitter or receiver of a signal beam for quantum key distribution; and a source of alignment beams that diverge from each other in a pattern that matches sensors on a station containing a receiver or transmitter for the quantum key distribution. The alignment beams from the handheld device are of sufficient intensity to produce on the station visible spots that facilitate manual alignment of the handheld device. The station can measure a position and a direction of respective alignment beams and dynamically steer the signal beam according to the measurements.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Joanna Duligall, Timothy Spiller, Radu Ionicioiu, Raymond G. Beausoleil, David A. Fattal
  • Publication number: 20120134675
    Abstract: An iterative method is provided for progressively building an end-to-end entanglement between qubits in first and second end nodes (91, 92) of a chain of nodes whose intermediate nodes (90) are quantum repeaters. At each iteration, a current operative repeater (90) of the chain merges an entanglement existing between qubits in the first end node (91) and the operative repeater, with a local entanglement formed between qubits in the operative repeater and its neighbour node towards the second end node (92). For the first iteration, the operative repeater is the neighbour of the first end node (91); thereafter, for each new iteration the operative repeater shifts one node further along the chain toward the second end node (92). A quantum repeater adapted for implementing this method is also provided.
    Type: Application
    Filed: October 26, 2009
    Publication date: May 31, 2012
    Inventors: William Munro, Keith Harrison, Timothy Spiller, Kae Nemoto
  • Patent number: 8170214
    Abstract: In order to facilitate alignment of a QKD transmitter and QKD receiver, the transmitter is provided with a retro-reflector for returning to the receiver a photon beam originating at the latter. The transmitter is arranged to polarization modulate the retro-reflected beam. The transmitter is provided both with an intensity detector for generating an indication of retro-reflected photon intensity, and an intensity-dependent controller for controlling the QKD transmitter in dependence on the detected photon intensity. In one embodiment, this control involves aborting operation of the QKD transmitter upon an unexpectedly high photon intensity being detected; in another embodiment, the intensity indication is used to control the attenuation of the retro-reflected beam so as stabilize the average retro-reflected photon count per unit time.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: May 1, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Keith Harrison, William Munro, Timothy Spiller, Michael Tan, Joanna Duligall, Radu Ionicioiu
  • Publication number: 20120039617
    Abstract: A handheld device (310) includes: a transmitter or receiver (410) of a signal beam (340) for quantum key distribution; and a source (412, 414) of alignment beams (312, 314, 316, 318) that diverge from each other in a pattern that matches sensors (322, 324, 326, 328) on a station (320) containing a receiver or transmitter (430) for the quantum key distribution. The alignment beams from the handheld device (310) are of sufficient intensity to produce on the station visible spots that facilitate manual alignment of the handheld device (310). The station (320) can measure a position and a direction of respective alignment beams and dynamically steer the signal beam (340) according to the measurements.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 16, 2012
    Inventors: Joanna Duligall, Timothy Spiller, Radu Ionicioiu, Raymond G. Beausoleil, David A. Fattal
  • Publication number: 20100080394
    Abstract: In order to facilitate alignment of a QKD transmitter and QKD receiver, the transmitter is provided with a retro-reflector for returning to the receiver a photon beam originating at the latter. The transmitter is arranged to polarization modulate the retro-reflected beam. The transmitter is provided both with an intensity detector for generating an indication of retro-reflected photon intensity, and an intensity-dependent controller for controlling the QKD transmitter in dependence on the detected photon intensity. In one embodiment, this control involves aborting operation of the QKD transmitter upon an unexpectedly high photon intensity being detected; in another embodiment, the intensity indication is used to control the attenuation of the retro-reflected beam so as stabilize the average retro-reflected photon count per unit time.
    Type: Application
    Filed: October 1, 2008
    Publication date: April 1, 2010
    Inventors: Keith Harrison, William Munro, Timothy Spiller, Michael Tan, Joanna Duligall, Radu Ionicioiu
  • Publication number: 20090310784
    Abstract: QKD receiving apparatus is provided with an alignment-correction system for correcting misalignment of a quantum signal received at an optical port of the apparatus relative to a quantum-signal detector of the receiving apparatus. The alignment-correction system comprises a misalignment measuring subsystem for making multiple different misalignment measures, and a misalignment compensation subsystem for adjusting the relative alignment of the quantum signal and quantum-signal detector in dependence on the misalignment measures made. The misalignment measuring subsystem comprises an alignment-beam source, an alignment-beam detector arrangement, and optical components for guiding an alignment beam from the alignment-beam source to the optical port, and for guiding the alignment beam, after external retro-reflection at a cooperating QKD transmitting apparatus from the optical port to the alignment-beam detector arrangement.
    Type: Application
    Filed: May 20, 2009
    Publication date: December 17, 2009
    Inventors: Joanna Duligall, Keith Harrison, William Munro, Timothy Spiller, Radu Ionicioiu
  • Publication number: 20080118201
    Abstract: A photonic interconnect method avoids high capacitance electric interconnects by using optical signals to communicate data between devices. The method can provide massively parallel information output by mapping logical addresses to frequency bands, so that modulation of a selected frequency band can encode information for a specific location corresponding to the logical address. Wavelength-specific directional couplers, modulators, and detectors, which can be fabricated at defects in a photonic bandgap crystal, can be employed for the photonic interconnect method. The interconnect method can be used for both classical and quantum information processing.
    Type: Application
    Filed: January 11, 2008
    Publication date: May 22, 2008
    Inventors: Raymond Beausoleil, Philip Kuekes, William Munro, Timothy Spiller, R. Williams, Sean Barrett
  • Publication number: 20080112703
    Abstract: A photonic interconnect system avoids high capacitance electric interconnects by using optical signals to communicate data between devices. The system can provide massively parallel information output by mapping logical addresses to frequency bands, so that modulation of a selected frequency band can encode information for a specific location corresponding to the logical address. The system comprises a first device containing a plurality of locations that are separately accessible and a plurality of optical decoders respectively associated with the locations; a second device that generates a logical address identifying a selected one of the locations in the first device; a converter capable of activating each of a plurality of components of an optical signal; and an optical path from the converter to each of the locations. The system can be used for both classical and quantum information processing.
    Type: Application
    Filed: January 11, 2008
    Publication date: May 15, 2008
    Inventors: Raymond Beausoleil, Philip Kuekes, William Munro, Timothy Spiller, R. Williams, Sean Barrett
  • Publication number: 20080112665
    Abstract: A photonic interconnect system avoids high capacitance electric interconnects by using optical signals to communicate data between devices. The system can provide massively parallel information output by mapping logical addresses to frequency bands, so that modulation of a selected frequency band can encode information for a specific location corresponding to the logical address. Wavelength-specific directional couplers, modulators, and detectors for the photonic interconnect system can be efficiently fabricated at defects in a photonic bandgap crystal. The interconnect system can be used for both classical and quantum information processing.
    Type: Application
    Filed: January 11, 2008
    Publication date: May 15, 2008
    Inventors: Raymond Beausoleil, Philip Kuekes, William Munro, Timothy Spiller, R. Williams, Sean Barrett
  • Publication number: 20070257201
    Abstract: A security system uses a source capable of producing an entangled state of a sensing mode and a reference mode. The sensing mode has a path that enters an area around an object being secured. A state measurement system in the security system can measure a combination of the sensing mode after traversal of the sensing path and the reference mode after traversal of a reference path.
    Type: Application
    Filed: May 3, 2006
    Publication date: November 8, 2007
    Inventors: Adrian Kent, William Munro, Timothy Spiller, Raymond Beausoleil
  • Publication number: 20070252081
    Abstract: We propose a practical method to generate cluster states for quantum computers. The qubit systems can be NV-centers in diamond, Pauli-blockade quantum dots with an excess electron or ion traps with optical transitions, which are subsequently entangled using a so-called double-heralded single-photon detection scheme. The fidelity of the resulting entanglement is extremely robust against the most important practical errors such as detector loss, light collection efficiency and mode mismatching. The cluster states are generated efficiently using a modified probabilistic teleportation protocol.
    Type: Application
    Filed: July 13, 2005
    Publication date: November 1, 2007
    Inventors: William Munro, Timothy Spiller, Sean Barrett, Pieter Kok
  • Publication number: 20070250280
    Abstract: Various embodiments of the present invention are directed to methods for determining a phase shift acquired by an entangled N-qubit system represented by a NOON state. In one embodiment, a probe electromagnetic field is coupled with each qubit system. The phase shift acquired by the qubit systems is transferred to the probe electromagnetic field by transforming each qubit-system state into a linear superposition of qubit basis states. An intensity measurement is performed on the probe electromagnetic field in order to obtain a corresponding measurement result. A counter associated with a measurement-result interval is incremented, based on the measurement result falling within the measurement-result interval. A frequency distribution is produced by normalizing the counter associated with each measurement-result interval for a number of trials.
    Type: Application
    Filed: April 19, 2006
    Publication date: October 25, 2007
    Inventors: Raymond Beausoleil, William Munro, Timothy Spiller, Pieter Kok, Sean Barrett, Kae Nemoto
  • Publication number: 20070172054
    Abstract: A device stores one-time pad data for use in carrying out various tasks. In order to preserve the ability to carry out important tasks that require the use of one-time data, use of the one-time pad data held by the device is controlled such that an amount of this one-time pad data is only usable by a predetermined set of important tasks comprising at least a replenishment task for replenishing the device with one-time pad data.
    Type: Application
    Filed: July 17, 2006
    Publication date: July 26, 2007
    Inventors: William Munro, Timothy Spiller, Martin Sadler, Christopher Tofts, Keith Harrison
  • Publication number: 20070145271
    Abstract: Structures and methods allow: transfer of quantum information represented using the states of light to a representation using the states of matter systems; transfer of quantum information represented by the states of matter systems to a representation using the states of light; and error resistant encoding of quantum information using entangled states of matter and light to minimize errors.
    Type: Application
    Filed: October 17, 2005
    Publication date: June 28, 2007
    Inventors: Raymond Beausoleil, William Munro, Timothy Spiller, Kae Nemoto
  • Publication number: 20070074277
    Abstract: Secret random data is distributed to a plurality of devices to provision them with new one-time pad data for use in interacting with apparatus holding the same one-time pad data. This distribution is effected by provisioning a first device with a block of secret random data that is, or will become, available to the apparatus. Part of the secret random data is then distributed from the first device to one or more other devices in a hierarchical distribution pattern headed by the first device. Each device, other than those at the bottom of the distribution hierarchy, retains part of the secret random data it receives and passes on the remainder. Each device uses that part of the secret random data it has retained to provide the device with new one-time pad data. A method is also provided for tracking service usage based on the. distributed one-time pad data.
    Type: Application
    Filed: July 21, 2006
    Publication date: March 29, 2007
    Inventors: Christopher Tofts, Timothy Spiller, William Munro, Martin Sadler, Keith Harrison
  • Publication number: 20070074276
    Abstract: A system is disclosed in which a plurality of devices are arranged to use one-time pad data to interact with apparatus holding the same one-time pad data. Each of the devices and the apparatus has its own one-time pad and the pads are all provisioned with the same new one-time pad data. Upon any one of the devices wishing to effect an interaction with the apparatus using one-time pad data, an alignment operation is carried out between a set of entities comprising at least the apparatus and the device wishing to carry out the interaction. The alignment operation serves to reduce the level of the one-time pad of at least the device wishing to carry out the interaction, to the level of the lowest one-time pad of the set of entities involved in the alignment operation.
    Type: Application
    Filed: July 19, 2006
    Publication date: March 29, 2007
    Inventors: Keith Harrison, Christopher Tofts, Timothy Spiller, Martin Sadler, William Munro
  • Publication number: 20070016794
    Abstract: In carrying out a task that consumes data from a one-time pad, task inputs comprising at least first data and second data from the pad, are combined together to form an output from which the data used from the pad cannot be recovered without knowledge of at least one of the first and second data. The task concerned can be, for example, the encrypting of a message or the creating of an attribute verifier.
    Type: Application
    Filed: June 16, 2006
    Publication date: January 18, 2007
    Inventors: Keith Harrison, Timothy Spiller, William Munro, Christopher Tofts
  • Publication number: 20060115086
    Abstract: A quantum random number generator uses measurements of a quantum state to generate a random value and to authenticate that the quantum state had the required properties for generation of a random series having the desired statistics. One exemplary embodiment generates an entangled photon pair in the singlet Bell state, measures one photon to extract a random value, and measures the other photon for confirmation that the photon pair were in the singlet Bell state. Another embodiment of the invention performs tomographic analysis of a state used for random number generation to confirm that the state used had the desired properties.
    Type: Application
    Filed: November 26, 2004
    Publication date: June 1, 2006
    Inventors: Raymond Beausoleil, William Munro, Timothy Spiller
  • Publication number: 20060056631
    Abstract: Quantum testing can compare unknown photon states in a manner suitable for a validation check of a quantum digital signature, testing of the operation of a quantum gate, or detecting of entanglement. The effect of the QSC system can be used to entangle input photon states. QSC system can include a control swap gate having a control channel that is measured, a beam splitter and a controlled phases gate with a control channel that is measured, or a beam splitter with a parity detector on an output channel. The operation of the QSC system can also be used to generate an entangled photon state.
    Type: Application
    Filed: September 13, 2004
    Publication date: March 16, 2006
    Inventors: Raymond Beausoleil, William Munro, Timothy Spiller, Willem van Dam