APPARATUS AND METHOD FOR GENERATING A KEY

WIPO Patent Application WO/2019/100694

A1

The present application relates to an apparatus and a method for generating a key and belongs to the field of quantum communication technology. The method comprises: modulating a first key onto a first source signal to obtain a modulated optical signal; splitting the modulated optical signal to obtain a first sub-modulated optical signal and a second sub-modulated optical signal; attenuating the first sub-modulated optical signal such that the number of photons included in the first sub-modulated optical signal is lower than a preset value, and transmitting the attenuated first sub-modulated optical signal to a receiving end device; obtaining a second key carried by the second sub-modulated optical signal, and storing the second key in a memory, wherein the second key is a key generated after an error occurs during modulation of the first key onto the first light source signal, and the second key is used when communicating with the receiving device. The method for generating a key provided by the embodiment of the present application can improve success rates in key preparation and transmission, thereby avoiding wastage of system resources.

JP4328401	Optical communication device
WO/2015/158641	A METHOD OF MODULATING LIGHT IN A TELECOMMUNICATION NETWORK
JP2004221747	ILLUMINATING LIGHT COMMUNICATION SYSTEM

LI ZHENGYU (CN)
SU CHANGZHENG (CN)
ZOU YANG (CN)
CAI YONGJING (CN)

PCT/CN2018/090471

May 31, 2019

June 08, 2018

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HUAWEI TECH CO LTD (CN)

H04B10/54

WO2006137021A1

2006-12-28

CN107086891A	2017-08-22
CN106850196A	2017-06-13
CN104539582A	2015-04-22
CN106788706A	2017-05-31
CN201711194180A	2017-11-24

See also references of EP 3678306A4

BEIJING SAN GAO YONG XIN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)

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