Phase reference sharing schemes for continuous-variable quantum cryptography
US10805075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2017 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Aug 2, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/2856
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems and associated methods of performing coherent optical communication of quantum information between an emitter A and a distant receiver B are provided, using a local local oscillator. Examples of LLO-based Continuous-Variable Quantum Key Distribution are described. Self-coherent schemes are used, the schemes consisting in deriving both signal and phase reference pulses from the same optical pulse thus ensuring an intrinsic strong signal to reference phase coherence. Different CV-QKD designs implementing various self-coherence phase sharing schemes are described and compared in terms of secret key rate and hardware requirements. Strong phase noise resilience can be obtained with standard telecom equipment such as low cost lasers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.