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Q: Quantenoptik

Q 50: Quantenkommunikation

Q 50.3: Vortrag

Freitag, 28. März 2003, 14:30–14:45, F102

Experimental demonstration of four party quantum secret sharing. — •Sascha Gaertner^1,2, Mohamed Bourennane^1,2, Manfred Eibl^1,2, Christian Kurtsiefer^1,2, and Harald Weinfurter^1,2 — ¹Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Str.1, 85748 Garching — ²Ludwig-Maximilians-Universität (LMU) München, Schellingstrasse 4/III, 80799 München

Quantum secret sharing is an extension of quantum key distribution to more than two parties, in such a way that all N partners have to cooperate to obtain a secure key [1]. We show how this multiparty secure communication scheme can be implemented experimentally using a polarisation entangled 4-photon state. This state is a superposition of a 4 photon GHZ-state and a product of two BELL-states. The state shows perfect correlations and violates a generalized Bell inequality. The easy generation of this state and the relative high visibility enable for the first time the realization of a 4-party quantum communication protocol.

[1] M. Hillery, V. Buzek and A. Berthiaume, Quantum secret sharing, Phys. Rev. A 59 (1999).