On the realization of Bell observables

Details On the realization of Bell observables On the realization of Bell observables

2004-06-11

arxiv.org/abs/quant-ph/0406077v1

Phys. Lett. A, Vol. 329/3 pp 188-192 (2004)

Physics

Quantum Physics

9 pages, elsart, 1 figure

Scientific paper

10.1016/j.physleta.2004.07.006

We show how Bell observables on a bipartite quantum system can be obtained by local observables via a controlled-unitary transformation. For continuous variables this result holds for the Bell observable corresponding to the non-conventional heterodyne measurement on two radiation modes, which is connected through a 50-50 beam-splitter to two local observables given by single-mode homodyne measurements. A simple scheme for a controlled-unitary transformation of continuous variables is also presented, which needs only two squeezers, a parametric downconverter and two beam splitters.

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