Communication with everlasting security from short-term-secure encrypted quantum communication
US10439808B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 2016 |
| Grant date | Oct 8, 2019 |
| Priority date | — |
| Expiry date | Mar 1, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of communicating a classical message M between a first party A and a second distant party B over a public channel F, comprises the steps of sharing a key between the parties, the shared key K comprising a short-term-secure key KS and/or a long-term-secure key KL; at A, encoding M as a quantum codeword, A using K to encode M into a first encrypted codeword belonging to a publicly known quantum code; communicating the first encrypted codeword from A to B over F whose output is a second codeword; unitarily transforming the second codeword into a third codeword by using a N-mode interferometer controlled by B, placed at the output of F and keyed by K; determining an estimate of M, at B, by performing a measurement on the third codeword and by processing the measurement using K.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.