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Title:
RECEPTION DEVICE, QUANTUM KEY DISTRIBUTION SYSTEM, AND METHOD FOR DETECTING QUANTUM SIGNAL
Document Type and Number:
WIPO Patent Application WO/2022/163575
Kind Code:
A1
Abstract:
The purpose of the present invention is to prevent interception in quantum key distribution. A quantum signal is incident on an interferometer (20), and the interferometer (20) decodes the quantum signal. Single-photon detectors (PD1, PD2) detect photons of the decoded quantum signal output from the interferometer (20). A signal processing unit (3) detects bits of the decoded quantum signal on the basis of the results of photon detection by the single-photon detectors (PD1, PD2). A control unit (2) switches, in the single-photon detectors (PD1, PD2), an output destination of two decoded quantum signals corresponding to one encoding base, and on the basis of the results of photon detection by each of the single-photon detectors (PD1, PD2), switches bits detected by the signal processing unit (3).

Inventors:
YOSHINO KEN-ICHIRO (JP)
FUJIWARA MIKIO (JP)
TOMITA AKIHISA (JP)
KOASHI MASATO (JP)
TAKEOKA MASAHIRO (JP)
SASAKI MASAHIDE (JP)
Application Number:
PCT/JP2022/002431
Publication Date:
August 04, 2022
Filing Date:
January 24, 2022
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Assignee:
NEC CORP (JP)
NAT INST INF & COMM TECH (JP)
UNIV HOKKAIDO NAT UNIV CORP (JP)
UNIV TOKYO (JP)
International Classes:
H04L9/12; H04B10/548; H04B10/70
Domestic Patent References:
WO2019106971A12019-06-06
Foreign References:
CN110784485A2020-02-11
JP2013539327A2013-10-17
JP2007020013A2007-01-25
CN113328806A2021-08-31
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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