公开(公告)号：US11770245B2

公开(公告)日：2023-09-26

申请号：US17488955

申请日：2021-09-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kyongchun Lim ,  Chun Ju Youn ,  Byung-seok Choi ,  Young-Ho Ko ,  Kap-Joong Kim ,  Minchul Kim ,  Ju Hee Baek ,  Joong-Seon Choe

IPC: H04L9/08

CPC classification number: H04L9/0855 ,  H04L9/0825 ,  H04L9/0858

Abstract: Disclosed is a quantum key distribution system using an RFI (reference frame independent) QKD (quantum key distribution) protocol, which includes a first signal processing circuit that generates transmission basis information and transmission bit information, a quantum channel transmitter that generates a single photon or coherent light, and modulates the single photon or the coherent light based on the transmission basis information and the transmission bit information to generate a quantum signal, a quantum channel receiver that receives the quantum signal through a quantum channel and detects reception bit information from the quantum signal based on reception basis information, and a second signal processing circuit that generates the reception basis information, transmits the reception basis information to the first signal processing circuit through a public channel, and receives the transmission basis information from the first signal processing circuit through the public channel.

公开(公告)号：US20240168307A1

公开(公告)日：2024-05-23

申请号：US18516066

申请日：2023-11-21

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kap Joong KIM ,  Chun Ju Youn ,  Young-Ho Ko ,  Minchul Kim ,  Seong Su Park ,  Kyongchun Lim ,  Byung-seok Choi ,  Joong-Seon Choe ,  Won Seok Han

IPC: G02B27/28

CPC classification number: G02B27/283 ,  G02B27/286

Abstract: Disclosed is a polarized light generating device based on an optical waveguide, which includes first to fourth input optical waveguides, respectively, for receiving input light from an outside, first to fifth optical splitters configured to receive at least one light and output the received at least one light as at least one light, and an optical converter configured to receive at least one light from the fifth optical splitter and convert the received light to generate polarized light. The polarized light generating device receives the input light through one of the first to fourth input optical waveguides, and generates a first polarized light, a second polarized light, a third polarized light, and a fourth polarized light. The first to fourth polarized lights belong to elements of two arbitrary two-dimensional mutually unbiased basis sets.

公开(公告)号：US11522618B2

公开(公告)日：2022-12-06

申请号：US17203186

申请日：2021-03-16

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kyongchun Lim ,  Chun Ju Youn ,  Young-Ho Ko ,  Kap Joong Kim ,  Minchul Kim ,  Byung-seok Choi ,  Joong-Seon Choe

IPC: H04B10/70 ,  H04L9/08

Abstract: Disclosed are a quantum information transmitter, a quantum communication system including the same, and an operating method of the quantum information transmitter. The quantum information transmitter includes a light source driver, a light source, and a light modulator. The light source driver generates a first light source driving signal having a first level and a second light source driving signal having a second level. The light source generates a first light signal having a first average number of photons in response to the first light source driving signal, and generates a second light signal having a second average number of photons in response to the second light source driving signal. The optical modulator modulates the first light signal to generate a target signal, and modulates the second light signal to generate a decoy signal.