Geometric Phases for Mixed States in Interferometry

Oct 2, 2000
Published in:
  • Phys.Rev.Lett. 85 (2000) 14, 2845
  • Published: Oct 2, 2000

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Abstract: (APS)
We provide a physical prescription based on interferometry for introducing the total phase of a mixed state undergoing unitary evolution, which has been an elusive concept in the past. We define the parallel transport condition that provides a connection form for obtaining the geometric phase for mixed states. The expression for the geometric phase for mixed state reduces to well known formulas in the pure state case when a system undergoes noncyclic and unitary quantum evolution.