Abstract: A method and a system for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication are provided. The method for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication according to the present disclosure, includes generating a photon in a quantum state from a first quantum light source including an alkali atom or an ensemble of alkali atoms therein as a medium, further generating a photon in a quantum state from a second quantum light source spatially separated from the first quantum light source, including the same medium as that of the first quantum light source therein, and oscillating a photon pair obtained by coupling the photons generated by the first and second quantum light sources as a continuous wave coherent photon (CWCP) for quantum communication.

Abstract: A method and a system for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication are provided. The method for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication according to the present disclosure, includes generating a photon in a quantum state from a first quantum light source including an alkali atom or an ensemble of alkali atoms therein as a medium, further generating a photon in a quantum state from a second quantum light source spatially separated from the first quantum light source, including the same medium as that of the first quantum light source therein, and oscillating a photon pair obtained by coupling the photons generated by the first and second quantum light sources as a continuous wave coherent photon (CWCP) for quantum communication.

Abstract: Provided are an auto-compensating quantum cryptography transceiver and method of transmitting a quantum cryptography key at a high speed. A quantum cryptography transmitter includes a wavelength converter, an optical attenuator, an optical phase modulator, and a Faraday mirror. A quantum cryptography receiver includes a polarization beam splitter, an optical coupler, an optical filter, and a photon detector. Thus, a limit of a transmission rate caused by Rayleigh scattering of an optical fiber can be overcome.

Abstract: Provided are an auto-compensating quantum cryptography transceiver and method of transmitting a quantum cryptography key at a high speed. A quantum cryptography transmitter includes a wavelength converter, an optical attenuator, an optical phase modulator, and a Faraday mirror. A quantum cryptography receiver includes a polarization beam splitter, an optical coupler, an optical filter, and a photon detector. Thus, a limit of a transmission rate caused by Rayleigh scattering of an optical fiber can be overcome.