公开(公告)号：EP4311160A1

公开(公告)日：2024-01-24

申请号：EP22186505.8

申请日：2022-07-22

申请人： Terra Quantum AG

发明人： Vinokur, Valerii M. ,  Kirsanov, Nikita S. ,  Lesovik, Gordey B. ,  Sekatski, Pavel ,  Kolybelnikov, Alexander ,  Pastushenko, Valeria ,  Kodukhov, Alexey

IPC分类号： H04L9/08

摘要： A quantum key distribution device comprises an input signal path adapted to receive a plurality of optical input signals from a transmitter device, an output signal path connected to the input signal path at a first end and adapted to emit a plurality of first optical output signals at a second end opposite to the first end, and a detector signal path connected to the input signal path at a third end and comprising a photon detector device at a fourth end opposite to the third end. The photon detector device is adapted to detect the optical input signals from the transmitter device, and the quantum key distribution device is adapted to establish a shared quantum cryptographic key with the transmitter device based on the detected optical input signals. The input signal path forms an input path of a Mach-Zehnder interferometer, and the output signal path and the detector signal path form output paths of the Mach-Zehnder interferometer.

公开(公告)号：EP4047861A1

公开(公告)日：2022-08-24

申请号：EP21168449.3

申请日：2021-04-14

申请人： Terra Quantum AG

发明人： Lesovik, Gordey ,  Kronberg, Dmitry ,  Kudukhov, Alexey ,  Pastushenko, Valeria ,  Kenbaev, Nurbolat ,  Kirsanov, Nikita ,  Sekatski, Pavel ,  Vinokur, Valerii ,  Sagingalieva, Asel

IPC分类号： H04L9/08

摘要： A method for quantum key distribution is implementable in a system with a plurality of data processing devices (10, 11). The method comprises: determining, in at least one of a first data processing device (10) and a second data processing device (11), an intrinsic loss along a quantum channel (13) between the first data processing device (10) and the second data processing device (11); generating, in the first data processing device (10), a first signal; generating, in the first data processing device (10), a pulse sequence comprising at least one test pulse and signal pulses generated from the first signal; transmitting the pulse sequence from the first data processing device (10) via the quantum channel (13) to the second data processing device (11); receiving the pulse sequence in the second data processing device (11), and determining, in the second data processing device (11), a second signal from the pulse sequence; determining invalid signal positions and providing the invalid signal positions in the first data processing device (10) and the second data processing device (11); determining, in the first data processing device (10), a first reconciled signal from the first signal and the invalid signal positions, and determining, in the second data processing device (11), a second reconciled signal from the second signal and the invalid signal positions; determining a total loss along the quantum channel (13) from the at least one test pulse received in the second data processing device (11), determining a signal loss from the total loss and the intrinsic loss, and providing the signal loss in the first and the second data processing device (10, 11); determining a shared key in the first and the second data processing device (10,11) by error correcting the first reconciled signal in the first data processing device (10) and error correcting the second reconciled signal in the second data processing device (11); and determining an amplified key in the first and the second data processing device (10, 11) from the shared key by shortening the shared key by a shortening amount that is determined from the signal loss.