US 12,294,414 B2
Method and device for multi-wavelength plug-and-play quantum key distribution without time delay due to wavelength conversion
Byungkyu Ahn, Seoul (KR); Sangrim Lee, Seoul (KR); Hojae Lee, Seoul (KR); and JaYeong Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 18/003,955
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Jul. 2, 2020, PCT No. PCT/KR2020/008684
§ 371(c)(1), (2) Date Dec. 30, 2022,
PCT Pub. No. WO2022/004922, PCT Pub. Date Jan. 6, 2022.
Prior Publication US 2023/0283384 A1, Sep. 7, 2023
Int. Cl. H04B 10/70 (2013.01)
CPC H04B 10/70 (2013.01) 11 Claims
OG exemplary drawing
 
1. A method for transmitting a first pulse train in a quantum communication system, the method performed by an apparatus and comprising:
receiving a random access (RA) preamble from another apparatus;
transmitting a random access response (RAR) to the another apparatus in response to the RA preamble;
performing a radio resource control (RRC) connection procedure with the another apparatus;
receiving data from the another apparatus; and
decoding the data based on key information,
wherein, based on that the first pulse train is generated in a laser diode of the apparatus and the first pulse train is transmitted from the apparatus to the another apparatus through a quantum channel after respectively passing through a first path and a second path, the key information is determined,
wherein the second path includes N paths,
wherein the N has a value less than or equal to K,
wherein the N and the K are natural numbers, and
wherein K is a maximum number of the second path.