Measurement of geometric phase for mixed states using single photon interferometry

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Geometric phase may enable inherently fault-tolerant quantum computation. However, due to potential decoherence effects, it is important to understand how such phases arise for {\it mixed} input states. We report the first experiment to measure mixed-state geometric phases in optics, using a Mach-Zehnder interferometer, and polarization mixed states that are produced in two different ways: decohering pure states with birefringent elements; and producing a nonmaximally entangled state of two photons and tracing over one of them, a form of remote state preparation.
To appear in Phys. Rev. Lett. 4 pages, 3 figures

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/92622

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0412216
 http://arxiv.org/abs/quant-ph/0412216
 Phys. Rev. Lett. 94, 050401 (2005)
 doi:10.1103/PhysRevLett.94.050401

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