Quantum-Relay-Assisted Key Distribution over High Photon Loss Channels

Details Quantum-Relay-Assisted Key Distribution over High Photon Loss Channels Quantum-Relay-Assisted Key Distribution over High Photon Loss Channels

2005-08-07

arxiv.org/abs/quant-ph/0508062v1

Physics

Quantum Physics

12 pages (with appendix), 3 figures, submitted

Scientific paper

The maximum distance of quantum communication is limited due to the photon loss and detector noise. Exploiting entanglement swapping, quantum relay could offer ways to extend the achievable distance by increasing the signal to noise ratio. In this letter we present an experimental simulation of long distance quantum communication, in which the superiority of quantum relay is demonstrated. Assisted by quantum relay, we greatly extend the distance limit of unconditional secure quantum communication.

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