Discrete variable quantum key distribution using conjugate homodyne detection
US12010225B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 2022 |
| Grant date | Jun 11, 2024 |
| Priority date | — |
| Expiry date | Aug 29, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0858
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and a receiver for generating quantum key(s) using conjugated homodyne detection is provided. The receiver may communicate with a transmitter via an insecure quantum channel and a classical channel to generate the quantum key(s). A decoder, in the receiver, may determine, based at least in part on quadratures X, P measured by conjugated homodyne detectors, a raw-key signal corresponding to a key signal generated by the transmitter, and a distribution of photon numbers corresponding to a quantum signal received via the insecure quantum channel. Information about the key signal is exchanged between the receiver and the transmitter via the classical channel and used to determine a quantum bit error rate of the determined raw-key signal. A gain is also obtained. A secure-key rate is calculated based at least in part on the gain, the quantum bit error rate, and the photon number distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.