Multiparty Quantum Remote Secret Conference

Details Multiparty Quantum Remote Secret Conference Multiparty Quantum Remote Secret Conference

2006-12-03

arxiv.org/abs/quant-ph/0612017v1

Chin. Phys. Lett. 24 (2007) 23-26

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

We present two schemes for multiparty quantum remote secret conference in which each legitimate conferee can read out securely the secret message announced by another one, but a vicious eavesdropper can get nothing about it. The first one is based on the same key shared efficiently and securely by all the parties with Greenberger-Horne-Zeilinger (GHZ) states, and each conferee sends his secret message to the others with one-time pad crypto-system. The other one is based on quantum encryption with a quantum key, a sequence of GHZ states shared among all the conferees and used repeatedly after confirming their security. Both these schemes are optimal as their intrinsic efficiency for qubits approaches the maximal value.

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