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Gaussian Quantum Discord

2010; American Physical Society; Volume: 105; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.105.020503

1092-0145

Paolo Giorda, Matteo G. A. Paris,

Quantum Mechanics and Applications

We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(ϱ) for bipartite Gaussian states. In particular, for squeezed-thermal states, we explicitly maximize the extractable information over Gaussian measurements: C(ϱ) is minimized by a generalized measurement rather than a projective one. Almost all squeezed-thermal states have nonzero Gaussian discord: They may be either separable or entangled if the discord is below the threshold C(ϱ) = 1, whereas they are all entangled above the threshold. We elucidate the general role of state parameters in determining the discord and discuss its evolution in noisy channels.