Polarization coding quantum cryptography system
AssigneeElectronics and Telecommunications Research Institute
InventorsChun-Ju Youn, Tae-Gon Noh
Life of this patent
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Abstract
Provided is a polarization coding quantum cryptography system. The quantum cryptography includes a light source, a quantum channel, an optical path selector, and a path-dependent polarization selector. The light source generates a signal light. The quantum channel is used as a path to transmit the signal light to a receiver unit. The optical path selector is disposed between the light source and the quantum channel to transmit the signal light to one of a plurality of propagation paths. The path-dependent polarization selector is disposed between the optical path selector and the quantum channel. Herein, the path-dependent polarization selector is configured to determine the polarization direction of the signal light according to the propagation path of the signal light.
Claims17
A quantum cryptography system comprising:
- a light source generating a signal light;
- a quantum channel used as a path to transmit the signal light to a receiver unit;
- an optical path selector disposed between the light source and the quantum channel;
- and
- a path-dependent polarization selector disposed between the optical path selector and the quantum channel, wherein
- the optical path selector and the path-dependent polarization selector are optically connected through more than two propagation paths;
- the optical path selector selects one of the propagation paths and transmits the signal light to the selected propagation path;
- and
- the path-dependent polarization selector is configured to determine a polarization direction of the signal light according to the selected propagation path.
A quantum cryptography system comprising:
- a quantum channel transmitting a signal light from a transmitter unit;
- more than two photon detectors detecting the signal light;
- and
- a polarization-dependent path selector disposed between the quantum channel and the photon detectors, wherein
- the polarization-dependent path selector and the photon detectors are optically connected through more than two propagation paths,
- the polarization-dependent path selector is configured to select one of the propagation paths and transmits the signal light to the selected propagation path;
- and
- the polarization-dependent path selector is configured to transmit the signal light to one of the photon detectors according to a polarization direction of the signal light.
Dependencies are inferred from the claim text.