Electronics and Telecommunications Research Institute

Kap-Joong Kim

Joong-Seon Choe

Chun Ju Youn

Young-Ho Ko

Byung-Seok Choi

Minchul Kim

Gyungock Kim

Jeong Woo Park

Ki Seok Jang

Hye Min Kim

In Gyoo Kim

Sang Gi Kim

Won Seok Han

Junghyung Pyo

Sanghoon Kim

Duk Jun Kim

Sahnggi Park

Dongwoo Suh

Byung Seok Choi

JiHo Joo

Do Won Kim

Dae Seo Park

Jongbum You

Kyongchun Lim

Byung-seok Choi

Mireu Lee

Ju Hee Baek

Heasin Ko

Kyoungchun Lim

Provided are a beam tracking module, a free-space quantum communication device, and a free-space optical communication device. The beam tracking module for free-space quantum communication includes a controller configured to determine a divergence angle of a reference beam on the basis of divergence angle control data, a beam path control optical part configured to output the reference beam, and a beam transmitter configured to adjust the divergence angle through the beam path control optical part so that the reference beam having the determined divergence angle is output.

Beam tracking module, free-space quantum communication device, and free-space optical communication device

Provided is a polarization decomposition device. The polarization decomposition device includes a polarization beam splitter configured to split an optical signal into a first polarized light having a first polarization direction and a second polarized light having a second polarization direction different from the first polarized light, a phase shifter configured to delay a phase of the first polarized light, a polarization rotator configured to rotate the second polarized light so that the polarization direction of the second polarized light is changed, and an interference beam splitter configured to allow the first polarized light in which the phase is delayed and the second polarized light in which the polarization direction is rotated to interfere with each other and split them into a third polarized light and a fourth polarized light.

Polarization decomposition device

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.

Quantum key distribution system and operation method thereof

Provided are a single-photon source device and a single-photon source system including same. The single-photon source device includes a substrate, a straight waveguide extending in a first direction on the substrate, a first coupling layer which is provided on the straight waveguide and has a first point defect, at least one first electrode which is adjacent to the first point defect and provided on the first coupling layer, a ring waveguide which is adjacent to the straight waveguide and provided on the substrate, and at least one second electrode provided on the ring waveguide.

Single-photon source device and single-photon source system including the same

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.

Quantum light source device and optical communication apparatus including the same

Provided is an electro-optic modulating device. The electro-optic modulating device includes an optical waveguide with a vertical structure and sidewalls of the vertical structure are used to configure a junction.

Electro-optic modulating device

Growing community of inventors

Daejeon, South Korea

Kap-Joong Kim