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Title:
LINEAR-OPTICAL-BASED HIGH-SPEED BELL STATE ANALYSIS METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/054747
Kind Code:
A1
Abstract:
The present specification provides a method by which a device determines a Bell state including a first state, a second state, and a third state in a quantum cryptography communication system, the method comprising: performing an initial access operation with at least one other device; receiving two photons from the at least one other device; determining whether the two photons are in the first state on the basis of the results of splitting by means of a beam splitter, the delay time being applied according to a polarization state by means of a first polarization beam splitter to a pulse split by the beam splitter; determining whether the two photons are in the second state on the basis of a detection time difference due to the delay time, the interference occurring, by means of a half wave plate, a second polarization beam splitter, and a polarization alignment module, in a pulse split by the first polarization beam splitter; and determining whether the two photons are in the third state on the basis of a result of the interference.

Inventors:
KIM JAYEONG (KR)
LEE SANGRIM (KR)
LEE HOJAE (KR)
AHN BYUNGKYU (KR)
Application Number:
PCT/KR2021/013368
Publication Date:
April 06, 2023
Filing Date:
September 29, 2021
Export Citation:
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Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04B10/70; H04B10/079; H04L9/08
Foreign References:
KR20200042331A2020-04-23
KR20080111491A2008-12-23
KR20160093946A2016-08-09
JP2017157997A2017-09-07
JP2016025550A2016-02-08
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
Download PDF:
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