Hannover 2003 – wissenschaftliches Programm
Q 37.2: Vortrag
Donnerstag, 27. März 2003, 14:15–14:30, F102
The entangling power of passive optical elements — •Michael Wolf1, Jens Eisert2, and Martin Plenio3 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Institut für Physik, Universität Potsdam — 3Physics Department, Imperial College, London
We investigate the entangling capability of passive optical elements, both qualitatively and quantitatively. We present a general necessary and sufficient condition for the possibility of creating distillable entanglement in an arbitrary multi-mode Gaussian state with the help of passive optical elements, thereby establishing a general connection between squeezing and the entanglement that is attainable by non-squeezing operations. Special attention is devoted to general two-mode Gaussian states, for which we provide the optimal entangling procedure, present an explicit formula for the attainable degree of entanglement measured in terms of the logarithmic negativity, and discuss several practically important special cases.