Quantum Bidirectional Secure Direct Communication via Entanglement Swapping

In light of a quantum secure direct communication (QSDC) scheme using entanglement swapping [Chin. Phys. Lett. 22 (2005) 18], by introducing additional local operations for encoding, we propose a bidirectional QSDC (BQSDC) protocol, in which two legitimate users can simultaneously exchange their respective messages. The rule for the users to retrieve his/her partner's messages is derived explicitly in the most general case. Eve's commonly used attack method has been discussed and can be detected with the security checking process.

[1]  Harald Weinfurter,et al.  Secure Communication with a Publicly Known Key , 2001 .

[2]  K. Boström,et al.  Deterministic secure direct communication using entanglement. , 2002, Physical review letters.

[3]  Antoni Wójcik.  Eavesdropping on the "ping-pong" quantum communication protocol. , 2003, Physical review letters.

[4]  Fuguo Deng,et al.  Two-step quantum direct communication protocol using the Einstein-Podolsky-Rosen pair block , 2003, quant-ph/0308173.

[5]  Qing-yu Cai,et al.  The "ping-pong" protocol can be attacked without eavesdropping. , 2003, Physical review letters.

[6]  Fuguo Deng,et al.  Reply to ``Comment on `Secure direct communication with a quantum one-time-pad' '' , 2004, quant-ph/0405177.

[7]  Zhi-Xi Wang,et al.  Deterministic secure direct communication using GHZ states and swapping quantum entanglement , 2004, quant-ph/0406082.

[8]  Cai Qing-yu,et al.  Deterministic secure communication without using entanglement , 2004 .

[9]  F. L. Yan,et al.  A scheme for secure direct communication using EPR pairs and teleportation , 2004 .

[10]  Fuguo Deng,et al.  Quantum secure direct communication with high-dimension quantum superdense coding , 2005 .

[11]  Gao Ting,et al.  A Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties , 2005 .

[12]  Yan Feng-Li,et al.  Controlled quantum teleportation and secure direct communication , 2005 .

[13]  Zhang Zhan-jun,et al.  Deterministic secure direct communication by using swapping quantum entanglement and local unitary operations , 2005 .

[14]  Shou Zhang,et al.  Secure direct communication based on secret transmitting order of particles , 2006, quant-ph/0601119.

[15]  Xin Ji,et al.  Three-party quantum secure direct communication based on GHZ states , 2006, quant-ph/0601125.

[16]  Yan Xia,et al.  Quantum Dialogue by Using the GHZ State , 2006 .