公开(公告)号：US20210306077A1

公开(公告)日：2021-09-30

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.

公开(公告)号：US20250164710A1

公开(公告)日：2025-05-22

申请号：US18646356

申请日：2024-04-25

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Joong-Seon CHOE ,  Kap-Joong KIM ,  Dong Churl KIM ,  Minchul KIM ,  Ju Hee BAEK ,  Chun Ju YOUN ,  Kyongchun LIM ,  Byung-seok CHOI

IPC: G02B6/42

Abstract: Provided are an optical alignment device and an optical alignment method. The optical alignment device includes an input optical fiber, a light source provided at one terminal of the input optical fiber to generate input light, an input stage provided at another terminal of the input optical fiber, an output stage spaced apart from the input stage, a stage driving control unit configured to control driving of the input and output stages, a camera configured to receive output light generated from the input light by the waveguide chip and detect a waveguide mode, an output optical fiber having one terminal connected to the output stage, an optical power meter configured to detect an intensity of the output light, and a system controller configured to determine the waveguide mode and the intensity of the output light.

公开(公告)号：US20230283459A1

公开(公告)日：2023-09-07

申请号：US17937325

申请日：2022-09-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kyongchun LIM ,  Chun Ju YOUN ,  Joong-Seon CHOE ,  Minchul KIM ,  Byung-seok CHOI

IPC: H04L9/08

CPC classification number: H04L9/0852

Abstract: A quantum key distribution system using an RFI (reference frame independent) QKD (quantum key distribution) protocol includes a quantum channel transmitter that generates a first quantum signal including quantum information and provides the first quantum signal to an external device through a quantum channel, a first public channel transceiver that generates an optical signal including first additional information related to a QKD operation, and transmits and receives the optical signal through a public channel, a second public channel transceiver that receives the optical signal through the public channel and generates a measurement result by measuring a circular polarization component of the optical signal, and a quantum channel receiver that receives the first quantum signal through the quantum channel, generates a second quantum signal by correcting a polarization distortion of the first quantum signal based on the measurement result, and demodulates the quantum information from the second quantum signal.

公开(公告)号：US20220141008A1

公开(公告)日：2022-05-05

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

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：US20210119076A1

公开(公告)日：2021-04-22

申请号：US17075966

申请日：2020-10-21

Applicant: Electronics and Telecommunications Research Institute

Inventor： Young-Ho KO ,  Kap-Joong KIM ,  Byung-seok CHOI ,  Won Seok HAN

IPC: H01L33/06 ,  H01L33/40 ,  H01L33/10 ,  H01L25/075 ,  H01L33/00 ,  H01L33/30

Abstract: Disclosed are a quantum light source and an optical communication apparatus including the same. The quantum light source device includes a vertical reflection layer disposed on a substrate, a lower electrode layer disposed on the vertical reflection layer, a horizontal reflection layer disposed on the lower electrode layer, a quantum light source disposed in the horizontal reflection layer, and an upper electrode layer disposed on the horizontal reflection layer.