Multiparty quantum-key-distribution protocol without use of entanglement

We propose a quantum-key-distribution protocol that enables three parties to agree at once on a shared common random bit string in the presence of an eavesdropper without use of entanglement. We prove its unconditional security and analyze the key rate.

[1]  Hoi-Kwong Lo,et al.  Multi-partite quantum cryptographic protocols with noisy GHZ States , 2007, Quantum Inf. Comput..

[2]  Cambridge,et al.  Multi-Particle Entanglement Purification Protocols , 1997, Technical Digest. 1998 EQEC. European Quantum Electronics Conference (Cat. No.98TH8326).

[3]  Shor,et al.  Simple proof of security of the BB84 quantum key distribution protocol , 2000, Physical review letters.

[4]  W Dür,et al.  Multiparticle entanglement purification for graph states. , 2003, Physical review letters.

[5]  Hoi-Kwong Lo,et al.  Conference key agreement and quantum sharing of classical secrets with noisy GHZ states , 2005, Proceedings. International Symposium on Information Theory, 2005. ISIT 2005..

[6]  A. Steane.  Multiple-particle interference and quantum error correction , 1996, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[7]  Shor,et al.  Good quantum error-correcting codes exist. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[8]  S. Popescu,et al.  Multi-Particle Entanglement Purification Protocols , 1997, Technical Digest. 1998 EQEC. European Quantum Electronics Conference (Cat. No.98TH8326).

[9]  Shun Watanabe,et al.  NOISE TOLERANCE OF THE BB84 PROTOCOL WITH RANDOM PRIVACY AMPLIFICATION , 2006 .

[10]  Mitsuru Hamada,et al.  Reliability of Calderbank?Shor?Steane codes and security of quantum key distribution , 2004 .

[11]  Sudhir Kumar Singh,et al.  Unconditionally Secure Multipartite Quantum Key Distribution , 2003 .

[12]  Imre Csiszár.  Linear codes for sources and source networks: Error exponents, universal coding , 1982, IEEE Trans. Inf. Theory.