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Q: Quantenoptik

Q 213: Quantum Information I

Q 213.5: Vortrag

Dienstag, 5. März 2002, 15:00–15:15, HS 11/215

Separability Criterion for all bipartite Gaussian States — •Geza Giedke^1,2, Barbara Kraus^1,2, Maciej Lewenstein³, and Ignacio Cirac^1,2 — ¹Max-Planck–Institut für Quantenoptik, D-85748 Garching — ²Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck — ³Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover

We provide a necessary and sufficient condition for separability of Gaussian states of bipartite systems of arbitrarily many modes. The condition provides an operational criterion since it can be checked by simple computation. Moreover, it allows us to find a pure product–state decomposition of any given separable Gaussian state. Our criterion is independent of the one based on partial transposition, and is strictly stronger.