on 01-07-2011
IX Symposium On Enabling Optical Networks and Sensors
Friday, 1st of July of 2011
AVEIRO - PORTUGAL
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on 01-07-2011
Daowen Qiu (SQIG, Instituto de Telecomunicações).
July 1, 2011, Friday, 15h.
Location: Room P4.35, Post-Graduation Building, IST.
Boyer, Kenigsberg, and Mor [Phys.Rev.Lett.99, 140501(2007)] proposed a new semi-quantum key distribution with four states where a key can be= securely distributed between Alice who can perform any quantum operation and Bob who works classically. We have proposed new protocols for semi-quantum key distribution with less than four states and their security has been analyzed in detail. Recently, this idea of ''semi-quantumness'' has been incorporated also to quantum secret sharing [Phys.Rev. A 82, 022303 (2010)], and a semi-quantum secret sharing protocol has been presented, where a quantum Alice, can share a secret key with two classical participants and they can collaborate to recover the secret, but none can do that alone. In the protocol, a three-particle maximally entangled state plays a crucial role. However, multipartite entangled states are generally difficult to prepare in experiments. Therefore, we also present a new protocol for semi-quantum secret
sharing where a quantum participant can share a secret key with two classical participants without using any entanglement. The protocol is also showed to be secure against eavesdropping.
Quantum Computation and Information Seminar
http://sem.math.ist.utl.pt/qci/index.xml
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