Eavesdropping on the "ping-pong" type quantum communication protocols with invisible photon

Details Eavesdropping on the "ping-pong" type quantum communication protocols with invisible photon Eavesdropping on the "ping-pong" type quantum communication protocols with invisible photon

2005-07-30

arxiv.org/abs/quant-ph/0508002v2

Phys. Lett. A 351, 23 (2006)

Physics

Quantum Physics

Scientific paper

10.1016/j.physleta.2005.10.050

The crucial issue of quantum communication protocol is its security. In this paper, we show that all the deterministic and direct two-way quantum communication protocols, sometimes called ping-pong (PP) protocols, are insecure when an eavesdropper uses the invisible photon to eavesdrop on the communication. With our invisible photon eavesdropping (IPE) scheme, the eavesdropper can obtain full information of the communication with zero risk of being detected. We show that this IPE scheme can be implemented experimentally with current technology. Finally, a possible improvement of PP communication protocols security is proposed. PACS:03.67.Hk

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