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1. 发明申请

WO2023067297A1 WAVELENGTH MULTIPLEXING FOR AN OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2023067297A1
公开(公告)日：2023-04-27
申请号：PCT/GB2022/052455
申请日：2022-09-28
申请人： ARQIT LIMITED
发明人： KOEHLER-SIDKI, Alexander , PARKER, Ryan , IQBAL, Omar
IPC分类号： H04B10/70 , H04J14/02 , H04L9/08
摘要： An optical communication system, a receiver, a transmitter, and a method of operating thereof are provided. The method includes: at a transmitter 2: emitting 50 N single-wavelength quantum beams from N faint photon sources 8; multiplexing 52 the N single-wavelength quantum beams using a first wavelength division multiplexer (WDM) 22 to produce a combined multi-wavelength quantum beam, wherein the combined multi-wavelength quantum beam comprises a series of interleaved single-photon events having different wavelengths, and has a repetition rate N times that of individual single-wavelength quantum beams; transmitting 54 the combined multi-wavelength quantum beam to a receiver; and at the receiver 3: de-multiplexing 56 the combined multi-wavelength quantum beam according to the wavelength using a second WDM 26 to recover the N single-wavelength quantum beams; at N single photon detection units, receiving a respective quantum beam of the N quantum beams and detecting single photon events resulting from the respective quantum beam, such that each single photon detection unit corresponds to a respective quantum beam and as such the respective wavelength of that quantum beam; tagging 64 each single photon detection event resulting from each single-wavelength quantum beam according to time, and at least one of: a wavelength of photons associated with the detection event, and an identity of the detecting single photon detection unit responsible for the detection event, thereby introducing a correlation between the time at which the detection event is registered, and at least one of: the wavelength of the photons associated with the detection event, and the identity of the detecting single photon detection unit responsible forthe detection event; and assigning a detection time-period to the detection event based on the correlation.

2. 发明申请

WO2023067298A1 OPTICAL SWITCHING FOR QUANTUM KEY DISTRIBUTION 审中-公开
公开(公告)号：WO2023067298A1
公开(公告)日：2023-04-27
申请号：PCT/GB2022/052456
申请日：2022-09-28
申请人： ARQIT LIMITED
发明人： KOEHLER-SIDKI, Alexander , PARKER, Ryan , IQBAL, Omar
IPC分类号： H04B10/70 , H04L9/08
摘要： A receiver (3), method, and system (1) for optical signal communication and software for operating a quantum key distribution (QKD) system are provided. The receiver (3) is configured to receive an optical signal from a transmitter (2) in an optical communication system, the receiver (3) comprising: at least a first (36a) and a second (36b) signal detection unit for detecting detection events associated with single photons; at least one optical switch (12) configured to alternate between engaging at least a first switch position and a second switch position, the first switch position being arranged to direct a received optical signal to the first signal detection unit (36a) and the second switch position being arranged to direct a received optical signal to the second signal detection unit (36b), such that the first (36a) and second (36b) signal detection units correspond to the first and second switch positions respectively; a detection time tagger (40) configured to tag the detection events at the first (36a) and second (36b) signal detection units according to time, switch position, and signal detection unit, thereby introducing a correlation between a time period in which a detection event is registered, the switch position, and the signal detection unit; and a timing recovery module (42) connected to the detection time tagger (40), wherein the timing recovery module (42) is configured to: use the correlation to verify whether or not a detection event has been tagged in the correct time period, and, if a detection event is found to be tagged in the incorrect time period, re-assign the detection event to the correct time period.

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