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US 10,948,342 B2Granted
Bell state measurement apparatus based on single-mode optical fiber
AssigneeKorea Research Institute of Standards and Science
InventorsSang Min Lee, Hee Su Park
Life of this patent
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Abstract
The present invention relates to a Bell state measurement apparatus capable of increasing a probability in which a determination that a Bell state measurement fails by using an optical fiber.
Claims12
A Bell state measurement apparatus comprising:
- two wave plate assemblies adjusting polarizations of two input photons, respectively;
- two optical fiber couplers focusing the input photons on two optical fibers, respectively;
- a 2×2 optical fiber directional coupler having input terminals connected to the two optical fibers, respectively;
- two optical fiber polarization controllers coupled to two output terminals of the 2×2 optical fiber directional coupler, respectively;
- two optical fiber polarizing beam splitters connected to outputs of the optical fiber polarization controllers, respectively;
- four 1×N optical fiber directional couplers each having one input terminal connected to an output of each of the optical fiber polarizing beam splitters;
- 4N single-photon detectors connected to output terminals of the 1×N optical fiber directional couplers, respectively;
- and
- a coincidence counting instrument analyzing coincidence counts between the single-photon detectors.
6 more elements
A Bell state measurement apparatus comprising:
- two wave plate assemblies adjusting polarizations of two input photons, respectively;
- two optical fiber couplers focusing the input photons on two optical fibers, respectively;
- a 2×2 optical fiber directional coupler having input terminals connected to the two optical fibers, respectively;
- two optical fiber polarization controllers coupled to two output terminals of the 2×2 optical fiber directional coupler, respectively;
- two optical fiber polarizing beam splitters connected to outputs of the optical fiber polarization controllers, respectively;
- four 1×N optical fiber directional couplers each having one input terminal connected to an output of each of the optical fiber polarizing beam splitters;
- 4N single-photon detectors connected to output terminals of the 1×N optical fiber directional couplers, respectively;
- a coincidence counting instrument analyzing coincidence counts between the single-photon detectors;
- an auxiliary laser source used for finding an optimal state of the wave plate assemblies and the optical fiber polarization controllers;
- polarizers measuring a polarization direction of the auxiliary laser source;
- quarter-wave plates adjusting a polarization of the auxiliary laser source;
- and
- power meters measuring an output of the auxiliary laser source.
10 more elements
Dependencies are inferred from the claim text.