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    METHOD FOR PERFORMING QUANTUM SECURE DIRECT COMMUNICATION IN QUANTUM COMMUNICATION SYSTEM, AND APPARATUS THEREFOR
    1.
    发明公开
    METHOD FOR PERFORMING QUANTUM SECURE DIRECT COMMUNICATION IN QUANTUM COMMUNICATION SYSTEM, AND APPARATUS THEREFOR 审中-公开

    公开(公告)号：US20240267133A1

    公开(公告)日：2024-08-08

    申请号：US18290639

    申请日：2021-07-21

    Applicant: LG Electronics Inc.

    Inventor： Byungkyu AHN ,  Sangrim LEE ,  Hojae LEE ,  Jayeong KIM

    IPC: H04B10/85

    CPC classification number: H04B10/85

    Abstract: The present specification provides a quantum secure direct communication (QSDC) method by which a transmitting end transmits a message on the basis of differential time coding, in a quantum communication system. More specifically, the method comprises the steps of: receiving, from a receiving end on a quantum channel, (i) at least one initial time state configured by including a time interval equal to a dead time of a single photon detector of the receiving end and (ii) at least one initial phase state; receiving, from the receiving end on a classical channel, time state location information for selecting a specific initial time state for encoding of information transmitted to the receiving end; selecting the specific initial time state for the encoding, on the basis of the time state location information: generating an encoding time state by encoding the information on the basis of the selected specific initial time state, the encoding time state being generated by applying a time shift on the basis of a value of the information being encoded; and transmitting a message including the encoding time state to the receiving end through the quantum channel, wherein the message is restored on the basis of a time difference between information on the at least one initial time state stored in the receiving end and information on the encoding time state.

    INHOMOGENEOUS POLARIZATION-BASED COHERENT TRANSCEIVER FOR BEAM ALIGNMENT AND METHOD THEREFOR
    7.
    发明申请
    INHOMOGENEOUS POLARIZATION-BASED COHERENT TRANSCEIVER FOR BEAM ALIGNMENT AND METHOD THEREFOR 有权

    公开(公告)号：US20250015890A1

    公开(公告)日：2025-01-09

    申请号：US18695712

    申请日：2022-10-04

    Applicant: LG Electronics Inc.

    Inventor： Hojae LEE ,  Sangrim LEE ,  Kijun JEON ,  JaYeong KIM ,  Byungkyu AHN

    IPC: H04B10/112 ,  G02B27/28 ,  G03B21/20

    Abstract: A method and a device used in an optical wireless communication (OWC) system are provided. A transmitting terminal transmits a plurality of reference signals to a receiving terminal through each of a plurality of beams. Each of the plurality of beams may have an inhomogeneous polarization beam pattern. The receiving terminal measures signal strength and polarization with respect to the plurality of reference signals. When the receiving terminal transmits feedback information including the measured signal strength information and polarization information to the transmitting terminal, the transmitting terminal may select at least one beam among the plurality of beams on the basis of the feedback information. Alternatively, the receiving terminal may select at least one beam from among the plurality of beams, which corresponds to at least one inhomogeneous polarization beam pattern among a plurality of inhomogeneous polarization beam patterns, on the basis of the measured signal strength and polarization.

    METHOD AND DEVICE FOR MULTI-WAVELENGTH PLUG-AND-PLAY QUANTUM KEY DISTRIBUTION WITHOUT TIME DELAY DUE TO WAVELENGTH CONVERSION
    9.
    发明公开
    METHOD AND DEVICE FOR MULTI-WAVELENGTH PLUG-AND-PLAY QUANTUM KEY DISTRIBUTION WITHOUT TIME DELAY DUE TO WAVELENGTH CONVERSION 审中-公开

    公开(公告)号：US20230283384A1

    公开(公告)日：2023-09-07

    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

    CPC classification number: 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.

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