Entanglement and visibility at the output of a Mach-Zehnder interferometer

Details Entanglement and visibility at the output of a Mach-Zehnder interferometer Entanglement and visibility at the output of a Mach-Zehnder interferometer

1998-11-27

arxiv.org/abs/quant-ph/9811078v1

Phys.Rev. A59 (1999) 1615

Physics

Quantum Physics

6 figs, accepted for publication on PRA, see also http://enterprise.pv.infn.it/~paris

Scientific paper

10.1103/PhysRevA.59.1615

We study the entanglement between the two beams exiting a Mach-Zehnder interferometer fed by a couple of squeezed-coherent states with arbitrary squeezing parameter. The quantum correlations at the output are function of the internal phase-shift of the interferometer, with the output state ranging from a totally disentangled state to a state whose degree of entanglement is an increasing function of the input squeezing parameter. A couple of squeezed vacuum at the input leads to maximum entangled state at the output. The fringes visibilities resulting from measuring the coincidence counting rate or the squared difference photocurrent are evaluated and compared each other. Homodyne-like detection turns out to be preferable in almost all situations, with the exception of the very low signals regime.

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