Quantum key distribution information leakage due to backflashes in single photon avalanche photodiodes
US10855456B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2020 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Apr 15, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/442
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A quantum cryptography apparatus and system includes a photon emitter, a photon receiver, a first photodetector, a second photodetector, a first polarization optic, and a second polarization optic. The photon emitter is configured to emit a photon at a wavelength. The photon receiver is coupled to the photon emitter by at least one quantum channel. The photon receiver includes the first polarization optic configured to output the emitted photon in a polarization state. The first photodetector is configured to detect the emitted photon from the output of the first polarization optic. The second photodetector is configured to detect a backflash from the first photodetector. The second polarization optic is between the first photodetector and the second photodetector. The second photodetector and the second polarization optic are configured to internally calibrate the photon receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.