Measurement of geometric phase for mixed states using single photon interferometry
Quantum Physics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.quant-ph/0412216,
title = {Measurement of geometric phase for mixed states using single photon interferometry},
author = {Marie Ericsson and Daryl Achilles and Julio T. Barreiro and David Branning and Nicholas A. Peters and Paul G. Kwiat},
journal= {arXiv preprint arXiv:quant-ph/0412216},
year = {2007}
}
Comments
To appear in Phys. Rev. Lett. 4 pages, 3 figures