US 12,445,275 B2
Method and device for estimating quantum bit error rate on basis of maximum bit group and two-dimensional parity
Byungkyu Ahn, Seoul (KR); Sangrim Lee, Seoul (KR); Hojae Lee, Seoul (KR); JaYeong Kim, Seoul (KR); and Sungjin Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 18/023,281
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Aug. 24, 2020, PCT No. PCT/KR2020/011256
§ 371(c)(1), (2) Date Feb. 24, 2023,
PCT Pub. No. WO2022/045378, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2023/0299950 A1, Sep. 21, 2023
Int. Cl. H04L 9/08 (2006.01); G06N 3/084 (2023.01); H03M 13/11 (2006.01); H04L 1/20 (2006.01)
CPC H04L 9/0852 (2013.01) [G06N 3/084 (2013.01); H03M 13/11 (2013.01); H04L 1/203 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a first device, a random access preamble from a second device;
transmitting, by the first device, a random access response to the second device in response to the random access preamble;
performing, by the first device, a radio resource control connection procedure with the second device;
receiving, by the first device, data from the second device;
receiving, by the first device, first two-dimensional parity information from the second device over a public channel;
obtaining, by the first device, second two-dimensional parity information from sifted key information,
wherein sifted key information comprises a plurality of first bit groups, and
wherein a length for each of the plurality of first bit groups is maximized for guaranteeing quantum bit error rate (QBER) estimation accuracy;
performing, by the first device, an estimation of a QBER based on the first two-dimensional parity information and the second two-dimensional parity information;
determining, by the first device, key information based on the estimation of the QBER; and
decrypting, by the first device, the data based on the key information.