Secured optical communications using quantum entangled two-photon transparency modulation
US8995842B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2009 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Feb 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method is disclosed wherein optical signals are coded in a transmitter by tuning or modulating the interbeam delay time (which modulates the fourth-order coherence) between pairs of entangled photons. The photon pairs are either absorbed or not absorbed (transparent) by an atomic or molecular fluorescer in a receiver, depending on the inter-beam delay that is introduced in the entangled photon pairs. Upon the absorption, corresponding fluorescent optical emissions follow at a certain wavelength, which are then detected by a photon detector. The advantage of the disclosed system is that it eliminates a need of a coincidence counter to realize the entanglement-based secure optical communications because the absorber acts as a coincidence counter for entangled photon pairs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.