Homodyne Bell's inequalities for entangled mesoscopic superpositions

Details Homodyne Bell's inequalities for entangled mesoscopic superpositions Homodyne Bell's inequalities for entangled mesoscopic superpositions

2000-10-17

arxiv.org/abs/quant-ph/0010062v2

Phys. Rev. A 63, 062102 (2001)

Physics

Quantum Physics

6 pages, 3 figures. Extended version, journal reference added

Scientific paper

10.1103/PhysRevA.63.062102

We present a scheme for demonstrating violation of Bell's inequalities using a spin-1/2 system entangled with a pair of classically distinguishable wave packets in a harmonic potential. In the optical domain, such wave packets can be represented by coherent states of a single light mode. The proposed scheme involves standard spin-1/2 projections and measurements of the position and the momentum of the harmonic oscillator system, which for a light mode can be realized by means of homodyne detection. We discuss effects of imperfections, including non-unit efficiency of the homodyne detector, and point out a close link between the visibility of interference and violation of Bell's inequalities in the described scheme.

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