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公开(公告)号：US12235155B2
公开(公告)日：2025-02-25
申请号：US18175618
申请日：2023-02-28
Applicant: Kabushiki Kaisha Toshiba
Inventor： Mirko Sanzaro , Christopher Meayers , James F. Dynes , Andrew Simpkins , Andrew James Shields
IPC: G01J1/44
Abstract: A photon detection system comprising an avalanche photodiode configured to generate a photodiode signal in response to an incident photon. The photon detection system also comprises a biasing circuit configured to supply a gating signal to the avalanche photodiode. The gating signal is a periodic signal configured to reverse bias the avalanche photodiode above and below its breakdown voltage for photon detection during each period. The photon detection system further comprises a non-reflective filter circuit configured to receive, at an input port, the photodiode signal, and provide, at a first output port, a first filtered output signal by applying a low-pass filter with a first cut-off frequency to the received photodiode signal.
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公开(公告)号：US20200274701A1
公开(公告)日：2020-08-27
申请号：US16797575
申请日：2020-02-21
Applicant: Kabushiki Kaisha Toshiba
Inventor： Zhiliang YUAN , Andrew James Shields
Abstract: A method of exchanging a combined cryptographic key between a first node and a second node, the first node and the second node being connected through a first communication and a second communication network, wherein the first communication network is a quantum communication network wherein information is encoded on weak light pulses; and the first node and the second node being configured to: exchange one or more first cryptographic keys on the first communication network; exchange one or more second cryptographic keys using the second communication network; and form the combined cryptographic key by combining the one or more first cryptographic keys and the one or more second cryptographic keys, such that the first node and the second node share knowledge of the combined cryptographic key.
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公开(公告)号：US20200150240A1
公开(公告)日：2020-05-14
申请号：US16678328
申请日：2019-11-08
Applicant: Kabushiki Kaisha Toshiba
Inventor： Jan HUWER , Richard Mark Stevenson , Taofiq Paraiso , Andrew James Shields , Joanna Krystyna Skiba-Szymanska
Abstract: An optical device, comprising: a first semiconductor substrate; a reference laser, configured to generate coherent light; a plurality of first optical components, wherein the reference laser is optically coupled to the plurality of first optical components, wherein each of the plurality of first optical components is configured to output coherent light during a period of time that coherent light from the reference laser is received; a plurality of second optical components, the second optical components configured to produce optical intensity modulation, wherein each of the plurality of first optical components is optically coupled to at least one corresponding second optical component; wherein the plurality of first optical components each comprises a laser, an optical amplifier or a phase modulator, and the plurality of second optical components each comprises a laser, an optical amplifier or an intensity modulator, and wherein when a first optical component comprises a laser or an optical amplifier the at least one corresponding second optical component comprises a laser, an optical amplifier or an intensity modulator, and wherein when a first optical component comprises a phase modulator the at least one corresponding second optical component comprises a laser or an optical amplifier; one or more first controllers, configured to apply phase control signals to said plurality of first optical components to apply a phase shift; one or more second controllers, configured to apply pulse control signals to said plurality of second optical components such that a light pulse is outputted during a period of time that coherent light is received, the relative phase between emitted light pulses from the plurality of second optical components being controlled by the relative phase shifts applied by the one or more first controllers; wherein the reference laser, plurality of first optical components and plurality of second optical components are integrated laterally on the semiconductor substrate in the plane parallel to the surface of the substrate.
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公开(公告)号：US10574450B2
公开(公告)日：2020-02-25
申请号：US15894356
申请日：2018-02-12
Applicant: Kabushiki Kaisha Toshiba
Inventor： Marco Lucamarini , Zhiliang Yuan , Andrew James Shields , James Dynes
Abstract: A quantum communication system for distributing a key between first and second units, the system being configured to implement phase-based measurement device independent quantum cryptography, the system comprising first and second units adapted to apply phase shifts to light pulses and a detection unit adapted to cause interference between light pulses received from the first and second units and measure said interference, wherein the first and second units each comprise at least one phase modulator adapted to apply a phase shift, said phase shift comprising a global phase component and a relative phase component, wherein said global phase component represents a phase shift selected randomly in the range from 0° to 360° from a fixed phase reference and said relative phase component is a phase shift selected randomly from 0°, 90°, 180° and 270° from the phase shift introduced by the global phase component.
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公开(公告)号：US10447408B2
公开(公告)日：2019-10-15
申请号：US15408698
申请日：2017-01-18
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Marco Lucamarini , Bernd Matthias Frohlich , James Dynes , Zhiliang Yuan , Andrew James Shields
Abstract: A communication system comprising n transmitters and a receiver, where n is an integer of at least 2, each of said n transmitters comprising a light source and an encoder such that each transmitter is adapted to output an encoded pulse of light, said receiver comprising a first element, the system further comprising a timing circuit, the timing circuit being configured to synchronize the encoded pulses output by the transmitters such that interference between a light pulse sent from the first transmitter and a light pulse from the second transmitter, interfere at the first element, each transmitter further comprising a suppressing element adapted to stop light exiting one of the transmitters such that the system is switchable between a first operation mode where two transmitters output encoded pulses and where both pulses interfere at the interference element and a second mode of operation where just one transmitter transmits light pulses to said receiver, the suppressing element being controlled to stop light exiting the other transmitter.
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Patent Agency Ranking
公开(公告)号：US10345233B2
公开(公告)日：2019-07-09
申请号：US14861606
申请日：2015-09-22
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Anthony John Bennett , David Julian Peter Ellis , Andrew James Shields , Thomas David Meany
Abstract: An optical measuring device for measuring a measurement region, the optical device comprising a photonic chip with an interferometer defined on said chip, said interferometer comprising first and second waveguides on said photonic chip and an interference region, wherein the first and second waveguides carry signals from the interference region to the sample region and back to the interference region, the device further comprising a phase adjusting unit configured to vary a phase difference between the signals in the first and second waveguides reflected by the measurement region.
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公开(公告)号：US10313113B2
公开(公告)日：2019-06-04
申请号：US14816293
申请日：2015-08-03
Applicant: Kabushiki Kaisha Toshiba
Inventor： Bernd Matthias Frohlich , Zhiliang Yuan , Andrew James Shields
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.
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公开(公告)号：US09996802B2
公开(公告)日：2018-06-12
申请号：US15434413
申请日：2017-02-16
Applicant: Kabushiki Kaisha Toshiba
Inventor： Anthony John Bennett , Andrew James Shields
CPC classification number: G06N99/002 , B82Y10/00 , Y10S977/774 , Y10S977/819 , Y10S977/951
Abstract: An optical system comprising a charged quantum dot having, a charged carrier, first and second ground state levels and a plurality of excited state levels, the first and second ground state energy levels having different spin states such that the said charged carrier cannot transfer between the first and second ground state energy levels without changing its spin state, the system further comprising a controller adapted to control a first radiating beam with energy not more than 100 micro-eV from a first transition within said quantum dot from a first ground state level to a selected excited state level from the plurality of excited state levels to, the system being adapted to enhance the decay rate of a second transition within said quantum dot from the selected excited state level to a second ground state level, but not a first transition, such that a photon is produced due to scattering of a photon from the first radiating beam, wherein the controller is adapted to irradiate the quantum dot with the first radiating beam for a time longer than the radiative lifetime of the selected excited state to produce just one photon, and wherein the first radiating beam comprises at least one pulse.
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公开(公告)号：US20180114877A1
公开(公告)日：2018-04-26
申请号：US15682695
申请日：2017-08-22
Applicant: Kabushiki Kaisha Toshiba
Inventor： David Julian Peter Ellis , Anthony John Bennett , Andrew James Shields
CPC classification number: H01L33/06 , G02B6/42 , G02B6/4201 , H01L27/15 , H01L33/58
Abstract: An optoelectronic system comprising a first member and a second member, said first member and said second member comprising a plurality of layers, wherein each member has a profiled mating surface, the first member being connected to the second member such that the growth direction of the layers of the first member are orthogonal to the growth direction of the layers of the second member and the profiled mating surfaces fit together, the first member comprises a waveguide circuit comprising a waveguide and the second member comprises an optoelectronic device with its own optical output which is connected to the waveguide of the first member, the first and second members also being electrically connected.
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公开(公告)号：US09654283B2
公开(公告)日：2017-05-16
申请号：US14855897
申请日：2015-09-16
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Joanna Krystyna Skiba-Szymanska , Richard Mark Stevenson , Andrew James Shields , Jan Henning Huwer
CPC classification number: H04L9/08 , H01S5/105 , H01S5/183 , H01S5/3412
Abstract: An optical device comprising: a substrate; a cavity structure on the substrate, comprising a quantum emitter in contact with one or more semiconductor layers; wherein the or all of the semiconductor layers in contact with the quantum emitter have a thickness larger than the height of the quantum emitter.
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