Reception device, quantum key distribution system, and method for detecting quantum signal
AssigneesNEC Corporation, National Institute of Information and Communications Technology, National University Corporation Hokkaido University, The University of Tokyo
InventorsKen-ichiro YOSHINO, Mikio FUJIWARA, Akihisa TOMITA, Masato KOASHI, Masahiro TAKEOKA
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Abstract
An object is to prevent eavesdropping in quantum key distribution. A synchronization signal reception device receives a synchronization signal that is an optical signal for defining a timing at which a quantum signal is detected, and outputs a reference signal corresponding to the synchronization signal. A clock signal generation unit generates a clock signal in response to the reference signal. A photon detection device detects a photon of the quantum signal in response to the clock signal. A timing of the clock signal randomly changes within a predetermined range.
Claims7
A reception device comprising:
- a synchronization signal reception device configured to receive a synchronization signal that is an optical signal for defining a timing at which a quantum signal is detected, and output a reference signal corresponding to the synchronization signal;
- a clock signal generation unit configured to generate a clock signal in response to the reference signal;
- a photon detection unit configured to detect a photon of the quantum signal in response to the clock signal;
- and
- a timing changing unit configured to randomly change a timing of the clock signal within a predetermined range.
A quantum key distribution system comprising:
- a transmission device configured to transmit a quantum signal;
- and
- a reception device including a photon detection device configured to detect the quantum signal,
- wherein the reception device includes:
- a synchronization signal reception device configured to receive a synchronization signal that is an optical signal for defining a timing at which the quantum signal is detected, and output a reference signal corresponding to the synchronization signal;
- a clock signal generation unit configured to generate a clock signal in response to the reference signal;
- a photon detection unit configured to detect a photon of the quantum signal in response to the clock signal;
- and
- a timing changing unit configured to randomly change a timing of the clock signal within a predetermined range.
A method for detecting a quantum signal, the method comprising:
- receiving a synchronization signal that is an optical signal for defining a timing at which a quantum signal is detected, and outputting a reference signal corresponding to the synchronization signal;
- generating a clock signal in response to the reference signal;
- detecting a photon of the quantum signal in response to the clock signal;
- and
- randomly changing a timing of the clock signal within a predetermined range.
Dependencies are inferred from the claim text.