公开(公告)号：EP4443774A1

公开(公告)日：2024-10-09

申请号：EP23219859.8

申请日：2023-12-22

申请人： Kabushiki Kaisha Toshiba

发明人： PARAISO, Taofiq ,  SIMPKINS, Andrew ,  SANZARO, Mirko ,  ROGER, Thomas ,  SHIELDS, Andrew James

IPC分类号： H04B10/70

CPC分类号： H04B10/70

摘要： An optical transmitter for quantum key distribution. The transmitter comprises a first and a second. Each laser is configured to emit phase-randomised pulses. The transmitter further comprises an optical combiner configured to combine the pulses emitted from the first and second laser into a combined stream of pulses based on an adjustable combining ratio. The transmitter further comprises a Mach-Zehnder interferometer with a short and a long arm. The interferometer has an input port configured to receive the combined stream of pulses and an output port configured to provide an output of the interferometer. At least one of the arms comprises a phase controlling element to control a phase between the short and long arm.

公开(公告)号：EP4002095A1

公开(公告)日：2022-05-25

申请号：EP21189926.5

申请日：2021-08-05

申请人： Kabushiki Kaisha Toshiba

发明人： MARANGON, Davide ,  SANZARO, Mirko ,  PARAISO, Taofiq ,  ROGER, Thomas ,  De MARCO, Innocenzo ,  YUAN, Zhiliang ,  SHIELDS, Andrew James

IPC分类号： G06F7/58

摘要： A system for generating a biased random bit stream, wherein said biased bit stream has different predetermined probabilities of occurrence for bit "0" and bit "1", said system comprising:
a true random generator unit configured to output a true random bit stream,
a pseudo random generator unit configured to output a pseudo random bit stream, said pseudo random bit stream comprising n bit words, where n is an integer of at least two;
a combining unit configured to combine a bit from said true random generator unit with an n -bit word from said pseudo random generator unit to output a processed n -bit word; and
an output unit configured to generate an output bit value from said processed n -bit word using a function, wherein said function is selected to control the probabilities of occurrence of the bit "0" values and bit "1" values to be the predetermined probabilities of occurrence.

公开(公告)号：EP4336155A1

公开(公告)日：2024-03-13

申请号：EP23158256.0

申请日：2023-02-23

申请人： Kabushiki Kaisha Toshiba

发明人： SANZARO, Mirko ,  MEAYERS, Christopher ,  DYNES, James F. ,  SIMPKINS, Andrew ,  SHIELDS, Andrew James

IPC分类号： G01J1/44 ,  H01L31/02 ,  H04N25/77

摘要： 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.

公开(公告)号：EP4001981A1

公开(公告)日：2022-05-25

申请号：EP21188871.4

申请日：2021-07-30

申请人： Kabushiki Kaisha Toshiba

发明人： PARAISO, Taofiq ,  SANZARO, Mirko ,  ROGER, Thomas ,  MARANGON, Davide ,  De MARCO, Innocenzo ,  YUAN, Zhiliang ,  SHIELDS, Andrew James

IPC分类号： G02B6/42 ,  B82Y10/00 ,  B82Y20/00

摘要： An optical module comprising:
a quantum photonic integrated circuit;
a temperature control element; and
a housing configured to house said photonic integrated circuit and said temperature control element,
wherein the photonic integrated circuit is attached to the temperature control element, such that said photonic integrated circuit is in thermal communication with said temperature control element; and
the temperature control element is attached directly to the housing, such that said temperature control element is in direct thermal communication with the housing.