公开(公告)号：US20240089093A1

公开(公告)日：2024-03-14

申请号：US18274871

申请日：2022-01-24

Applicant: NEC CORPORATION ,  NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY ,  THE UNIVERSITY OF TOKYO

Inventor： Ken-ichiro YOSHINO ,  Mikio FUJIWARA ,  Akihisa TOMITA ,  Masato KOASHI ,  Masahiro TAKEOKA ,  Masahide SASAKI

IPC: H04L9/08 ,  G06N10/40

CPC classification number: H04L9/0852 ,  G06N10/40

Abstract: An object is to prevent eavesdropping in quantum key distribution. A decoding unit decodes a quantum signal incident thereinto. A plurality of detect photons of the decoded quantum signal output from the decoding unit. A signal processing unit detects bits of the decoded quantum signal based on photon detection results of the plurality of detectors. A control unit perform switching processing by switching destinations to which two decoded quantum signals corresponding to one encoding basis are output between the plurality of detectors, and switching the bits detected by the signal processing unit based on the respective photon detection results of the plurality of detectors.

公开(公告)号：US20200344170A1

公开(公告)日：2020-10-29

申请号：US16924535

申请日：2020-07-09

Applicant: NEC Corporation

Inventor： Takao OCHI ,  Ken-ichiro YOSHINO ,  Akio TAJIMA

IPC: H04L12/803 ,  H04L9/12 ,  H04L9/08

Abstract: A first device transmits a first random number to a second device through a first quantum channel, and receives a second random number from the second device through a second quantum channel. The first device generates a first encryption key based on the first random number and the second random number. The second device transmits the second random number to the first device through the second quantum channel, and receives the first random number from the first device through the first quantum channel. The second device generates a second encryption key based on the first random number and the second random number.

公开(公告)号：US20190245685A1

公开(公告)日：2019-08-08

申请号：US16331685

申请日：2017-08-31

Applicant: NEC CORPORATION ,  NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY

Inventor： Ken-ichiro YOSHINO ,  Mikio FUJIWARA ,  Masahide SASAKI ,  Akihisa TOMITA

IPC: H04L9/08 ,  H04B10/508 ,  H04J7/00 ,  H04L29/06

CPC classification number: H04L9/0858 ,  H04B10/508 ,  H04B10/516 ,  H04B10/70 ,  H04J7/00 ,  H04L9/08 ,  H04L9/12 ,  H04L63/1475

Abstract: A quantum key distribution device is provided with an encoding unit which encodes an optical pulse train; an intensity modulating unit which subjects the encoded optical pulse train to N (where N is an integer at least equal to 3) types of intensity modulation having mutually different intensities, with different timings; and a first key distillation processing unit which generates an encryption key on the basis of a data sequence obtained by removing data obtained from an optical pulse having a specific modulation pattern from a data sequence used by the encoding unit and the intensity modulating unit.

公开(公告)号：US20150369657A1

公开(公告)日：2015-12-24

申请号：US14766667

申请日：2014-02-24

Applicant: NEC CORPORATION

Inventor： Ken-ichiro YOSHINO

IPC: G01J1/04 ,  G01J1/42

CPC classification number: G01J1/0418 ,  G01J1/16 ,  G01J1/26 ,  G01J1/4228 ,  G01J2001/442 ,  G01J2001/444

Abstract: (Object) To provide an optical receiver and a control method thereof that enable equalization of both the quantum efficiencies and the dark count probabilities of multiple photon detectors.(Solving Means) An optical receiver includes multiple photon detectors, a first equalizing means that equalizes either dark count probabilities or quantum efficiencies of the multiple photon detectors, and a second equalizing means that equalizes the other ones without affecting the equalization by the first equalizing means.

Abstract translation: （对象）提供能够均衡多个光子检测器的量子效率和暗计数概率的光接收器及其控制方法。 （解决方案）光接收机包括多个光子检测器，第一均衡装置，其均衡多个光子检测器的暗计数概率或量子效率;以及第二均衡装置，其在不影响第一均衡装置的均衡的情况下均衡其他光子检测器 。