公开(公告)号：US12284273B2

公开(公告)日：2025-04-22

申请号：US18044865

申请日：2020-09-11

Applicant: LG Electronics Inc.

Inventor： JaYeong Kim ,  Hojae Lee ,  Byungkyu Ahn ,  Byounghoon Kim ,  Sangrim Lee

IPC: H04L9/08 ,  G02B27/28 ,  H04B10/70

Abstract: Provided is a method and device for correcting an error in a communication system, the method including: transmitting, to another device, data encrypted based on key information. The key information is obtained by: incident a detection pulse on a variable Faraday rotating mirror and a reference pulse on a first mirror, respectively, wherein the detection pulse and the reference pulse are pulses branched from a test pulse; generating a first current in a balanced photodetector (BPD) based on a first component obtained as the detection pulse is reflected from the variable Faraday rotating mirror and a second component obtained as the reference pulse is reflected from the first mirror; converting the first current into a second current; incident the second current on the variable Faraday rotating mirror; and correcting the error in the variable Faraday rotating mirror based on the incident second current.

公开(公告)号：US12126387B2

公开(公告)日：2024-10-22

申请号：US18014052

申请日：2020-07-02

Applicant: LG ELECTRONICS INC.

Inventor： JaYeong Kim ,  Byungkyu Ahn ,  Sangrim Lee ,  Hojae Lee

IPC: H04B10/70 ,  H04B10/077 ,  H04L9/08

CPC classification number: H04B10/70 ,  H04B10/077 ,  H04L9/0852

Abstract: Provided are a device and a method performed by the device to correct an error in a quantum communication system. The method is characterized by comprising: transmitting a random access (RA) preamble to another device; receiving a random access response (RAR) from the other device as a response to the RA preamble; performing a radio resource control (RRC) connection procedure with the other device; and transmitting data to the other device, wherein the data is encoded on the basis of key information, the error is measured on the basis of a test pulse, and the key information is distributed to the device and the other device on the basis of the error being corrected using an improved Faraday rotator mirror of the device.

公开(公告)号：US12294414B2

公开(公告)日：2025-05-06

申请号：US18003955

申请日：2020-07-02

Applicant: LG ELECTRONICS INC.

Inventor： Byungkyu Ahn ,  Sangrim Lee ,  Hojae Lee ,  JaYeong Kim

IPC: H04B10/70

Abstract: The present specification provides a method and a device, the method, performed by a device, for transmitting a first pulse train in a quantum communication system being characterized by: receiving a random access (RA) preamble from another device; transmitting an RA response (RAR) to the other device as a response to the RA preamble; performing a radio resource control (RRC) connection process with the other device; receiving data from the other device; and decoding the data on the basis of key information, wherein a first pulse train is generated in a laser diode of the device, and the key information is determined on the basis that the first pulse train passes through both a first path and a second path and is then transmitted from the device to the other device via a quantum channel.

公开(公告)号：US20250068957A1

公开(公告)日：2025-02-27

申请号：US18726776

申请日：2022-12-28

Applicant: LG ELECTRONICS INC.

Inventor： Jayeong Kim ,  Sangrim Lee ,  Hojae Lee ,  Byungkyu Ahn

IPC: G06N10/70 ,  G06N10/40

Abstract: Provided is an operation method of a first node in a communication system, according to various embodiments of the present disclosure, the method comprising the steps of: receiving one or more synchronization signals from a second node; receiving system information from the second node; identifying, for a bit flip channel, a bit correlation of a first number of n first qubits constituting an entanglement state between the first node and the second node; generating, on the basis of the bit correlation, a second number of n−1 auxiliary qubits; after an interaction with respect to the bit flip channel occurs, determining, on the basis of the second number of n−1 auxiliary qubits, whether a bit flip error has occurred with respect the entanglement state; and, if the bit flip error is determined to have occurred, carrying out error correction by means of a bit flip operation for the first qubits.

公开(公告)号：US12218789B2

公开(公告)日：2025-02-04

申请号：US18000352

申请日：2020-06-01

Applicant: LG ELECTRONICS INC.

Inventor： Hojae Lee ,  Sangrim Lee ,  Bonghoe Kim ,  Sunam Kim ,  Kijun Jeon ,  Byungkyu Ahn

IPC: H04L27/26 ,  H04B10/11 ,  H04B10/40 ,  H04L7/00

Abstract: The present specification provides a method, performed by a device, for transmitting information about a pencil beam timing offset in a wireless optical communication system, in which a reference synchronization time is obtained, wherein the reference synchronization time is obtained on the basis of a cell-reference synchronization signal (C-RSS) received from another device, a peak energy time is obtained, the pencil beam timing offset is obtained on the basis of the reference synchronization time and the peak energy time, and information about the pencil beam timing offset is transmitted to the other device.