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Q: Quantenoptik

Q 18: Quanteninformation 3

Q 18.6: Vortrag

Dienstag, 25. März 2003, 15:15–15:30, F102

Entanglement transformations of pure Gaussian states — •Jens Eisert^1,2, Géza Giedke^3,4, Ignacio Cirac³, and Plenio Martin² — ¹Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam — ²Blackett Laboratory, Imperial College, Prince Consort Road, SW7 2BW London — ³Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, D-85748 Garching — ⁴4. Physikalisches Institut, Pfaffenwaldring 57, 70550 Stuttgart

We present a theory of entanglement transformations of Gaussian pure states with local Gaussian operations and classical communication. This is the experimentally accessible set of operations that can be realized with optical elements such as beam splitters, phase shifts and squeezers, together with homodyne measurements. We provide a simple necessary and sufficient condition for the possibility to transform a pure bipartite Gaussian state into another one. We contrast our criterion with what is possible if general local operations are available.