Measurement of geometric phase for mixed states using single photon interferometry

Marie Ericsson, Daryl Achilles, Julio T. Barreiro, David Branning, Nicholas A. Peters, Paul G. Kwiat

Research output: Contribution to journalArticlepeer-review


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 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.

Original languageEnglish (US)
Article number050401
JournalPhysical review letters
Issue number5
StatePublished - Feb 11 2005

ASJC Scopus subject areas

  • General Physics and Astronomy


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