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公开(公告)号：US11621780B2
公开(公告)日：2023-04-04
申请号：US17652562
申请日：2022-02-25
摘要： An emitter configured to output a sequence of periodic light pulses with different polarisations, the emitter comprising: a beam splitter configured to divide the pulses of a first sequence of pulses, such that each pulse is split between a first path and a second path, the first sequence of pulses having a varying phase and a first polarisation; a polarisation rotator configured to rotate the polarisation state of pulses in one of the first path or the second path with respect to the polarisation state of pulses in the other path; a time delay component configured to provide a time delay such that the first sequence of pulses in the first arm are delayed by one period with respect to the first sequence of pulses in the second arm; an optical combination component configured to combine the delayed first sequence of pulses from the first path with the first sequence of pulses from the second path to produce an output sequence of pulses where each pulse in the output sequence is a combination of a pulse from the second path and a delayed pulse from the first path and has a polarisation determined from the phase difference between combined pulses and the polarisation of the first path and the second path.
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公开(公告)号：US11309970B2
公开(公告)日：2022-04-19
申请号：US17186242
申请日：2021-02-26
IPC分类号： H04B10/50 , H04B10/548 , H04B10/508
摘要： An optical source including: a phase-randomised light source including a master light source configured to intermittently generate master light pulses; a slave light source optically coupled to the master light source and configured to receive the master light pulses, and that generates a sequence of slave light pulses during each period of time that a master light pulse is received; and an interferometer optically coupled to the slave light source and configured to receive sequences of slave light pulses, delay the received sequences by the first time interval to form delayed sequences of slave light pulses, interfere the received sequences with the delayed sequences, such that pulses from a received sequence interfere with adjacent pulses of the delayed sequence, and output interfered pulses including first and second output pulses that have a first and second predetermined amplitude respectively and a predetermined relative phase between them.
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公开(公告)号：US09800352B2
公开(公告)日：2017-10-24
申请号：US14798838
申请日：2015-07-14
IPC分类号： H04B10/00 , H04B10/85 , H04B10/70 , H04B10/2581
CPC分类号： H04B10/85 , H04B10/2581 , H04B10/70
摘要： A quantum communication system, comprising: a quantum transmitter optically coupled to a first waveguide; a first communication device optically coupled to a second waveguide; a multi-core optical fiber comprising a first core and a second core; a spatial multiplexing unit, configured to optically couple the first waveguide to the first core and the second waveguide to the second core.
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公开(公告)号：US09377356B2
公开(公告)日：2016-06-28
申请号：US14517471
申请日：2014-10-17
CPC分类号： G01J1/44 , G01J2001/442 , G01J2001/4466 , H04B10/697
摘要： A photon detection system including a photon detector configured to detect single photons, a signal divider to divide the output signal of the photon detector into a first part and a second part, wherein the first part is substantially identical to the second part, a delay mechanism to delay the second part with respect to the first part, and a combiner to combine the first and delayed second parts of the signal such that the delayed second part is used to cancel periodic variations in the first part of the output signal.
摘要翻译： 一种光子检测系统，包括配置成检测单个光子的光子检测器，用于将光子检测器的输出信号划分成第一部分和第二部分的信号分配器，其中第一部分基本上与第二部分相同;延迟机构 相对于第一部分延迟第二部分，以及组合器，以组合信号的第一和延迟的第二部分，使得延迟的第二部分被用于消除输出信号的第一部分中的周期性变化。
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公开(公告)号：US20140105598A1
公开(公告)日：2014-04-17
申请号：US14049655
申请日：2013-10-09
IPC分类号： H04B10/079 , H04B10/70
CPC分类号： H04B10/07955 , H04B10/70
摘要： A detection system for monitoring the intensity of a stream of modulated pulses, the system comprising a controller configured to provide a control signal to a component outputting modulated pulses the control signal controlling the level of modulation for each pulse exiting the component and a detector configured to measure the intensity of the pulses in the stream of pulses exiting the component outputting modulated pulses, wherein the detector comprises a gated detector, the controller being configured to send a gating signal to said detector, wherein said gating signal varies the gain of the detector with the control signal, such that pulses with a selected modulation level can be detected.
摘要翻译： 一种用于监测调制脉冲流的强度的检测系统，该系统包括控制器，该控制器被配置为向输出调制脉冲的分量提供控制信号，控制信号控制离开组件的每个脉冲的调制电平，以及检测器，被配置为 测量离开输出调制脉冲的分量的脉冲流中的脉冲的强度，其中检测器包括门控检测器，该控制器被配置为向所述检测器发送选通信号，其中所述门控信号改变检测器的增益， 控制信号，使得可以检测到具有选择的调制电平的脉冲。
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公开(公告)号：US11709657B2
公开(公告)日：2023-07-25
申请号：US16804286
申请日：2020-02-28
发明人： Taofiq Paraiso , Davide Marangon , Thomas Roger , Zhiliang Yuan , Andrew Shields
CPC分类号： G06F7/588 , G01J9/02 , G06N10/00 , H01S5/0428 , H01S5/12 , H01S5/4012 , H04L9/0852 , H04L9/0869
摘要： An optical device for a quantum random number generator comprising:
a source of phase randomised pulses of light, the source of phase randomised pulses of light further comprising
a plurality of gain-switched lasers, each gain-switched laser having an output, and each gain-switched laser being configured to emit a stream of pulses such that the phase of each pulse in the stream of pulses is randomised, and
an optical pulse combiner, the optical pulse combiner being configured to receive streams of pulses from the output of each gain-switched laser, combine the streams of pulses with one another into a combined stream of pulses and direct the combined stream of pulses into at least one output of the optical pulse combiner, the at least one output of the optical pulse combiner being the output of the source of phase randomised pulses of light;
wherein the source of phase randomised pulses of light is configured such that the streams of pulses of light emitted by the plurality of gain-switched lasers are temporally offset relative to one another,
a phase measurement element, the phase measurement element being configured to receive the combined stream of pulses from the output of the source of phase randomised pulses of light; and
an optical detector, the optical detector being optically coupled to the phase measurement element.-
公开(公告)号：US11223419B1
公开(公告)日：2022-01-11
申请号：US17187518
申请日：2021-02-26
IPC分类号： H04B10/00 , H04B10/079 , H04B10/61 , H04J14/02 , H04B10/50
摘要： An optical system comprising a first emitter and a receiver, said first emitter comprising an encoding unit configured to encode information using phase on a first optical information signal, said first information signal having a single first wavelength, said emitter being configured to output a reference signal, said reference signal having a reference wavelength which is different to the first wavelength, the emitter further comprising a multiplexer configured to multiplex the first information signal and the reference signal to produce a multiplexed first signal and output the multiplexed first signal to a communication channel said receiver comprising: a de-multiplexer configured to de-multiplex the multiplexed first signal received from the emitter to extract the first information signal and the reference signal; a decoder configured to decode the phase information in the first information signal; and a phase compensation unit configured to estimate the phase change of the first information signal caused by the communication channel from the first reference signal and to compensate the decoder for the phase change of the first information signal caused by the communication channel.
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公开(公告)号：US20190393675A1
公开(公告)日：2019-12-26
申请号：US16451183
申请日：2019-06-25
摘要： An apparatus for measuring an input signal, the apparatus comprising: a first light source configured to output a sequence of pulses of light, wherein there is a random relationship between the phase of the pulses; a beam splitter having first and second inputs and first and second outputs, said first input being arranged to receive light pulses from said first light source and the second input being arranged to receive said input signal; a differencing circuit adapted to subtract signals obtained from the first and second outputs from each other; and output a value; and a processing circuit adapted to estimate the minimum entropy of said input signal, from the output of the differencing circuit corresponding to a sequence of said light pulses from the first light source.
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公开(公告)号：US09853727B2
公开(公告)日：2017-12-26
申请号：US14962361
申请日：2015-12-08
IPC分类号： H04B10/079 , H04B10/70
CPC分类号： H04B10/07955 , H04B10/70
摘要： A detection system for monitoring the intensity of a stream of modulated pulses, the system comprising a controller configured to provide a control signal to a component outputting modulated pulses the control signal controlling the level of modulation for each pulse exiting the component and a detector configured to measure the intensity of the pulses in the stream of pulses exiting the component outputting modulated pulses, wherein the detector comprises a gated detector, the controller being configured to send a gating signal to said detector, wherein said gating signal varies the gain of the detector with the control signal, such that pulses with a selected modulation level can be detected.
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公开(公告)号：US09634770B2
公开(公告)日：2017-04-25
申请号：US14734286
申请日：2015-06-09
CPC分类号： H04B10/70
摘要： A transmitter for a quantum communication system, the transmitter comprising an interferometer, the interferometer having a first path with a phase modulator and a second path configured such that light pulses entering the interferometer follow either the first path or the second path, the output of the first and second paths being combined, the transmitter further comprising an optical filter positioned such that photons exiting the interferometer pass through the optical filter, the optical filter being configured to restrict the frequency range of pulses passing through the optical filter and temporally broaden the pulses.
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