Quantum secure communication scheme with W state

Details Quantum secure communication scheme with W state Quantum secure communication scheme with W state

2006-03-16

arxiv.org/abs/quant-ph/0603144v1

Commun. Theor. Phys., 2007, 48(4):637-640

Physics

Quantum Physics

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Scientific paper

Recently, Cao et al. proposed a new quantum secure direct communication scheme using W state. In their scheme, the error rate introduced by an eavesdropper who takes intercept-resend attack, is only 8.3%. Actually, their scheme is just a quantum key distribution scheme because the communication parties first create a shared key and then encrypt the secret message using one-time pad. We then present a quantum secure communication scheme using three-qubit W state. In our scheme, the error rate is raised to 25% and it is not necessary for the present scheme to use alternative measurement or Bell basis measurement. We also show our scheme is unconditionally secure.

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