Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 14, Pages 2845-2849Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2845
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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.
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