Geometric phases for mixed states in interferometry

Details Geometric phases for mixed states in interferometry Geometric phases for mixed states in interferometry

2000-05-17

arxiv.org/abs/quant-ph/0005072v2

Phys. Rev. Lett. 85 (2000) 2845.

Physics

Quantum Physics

Two column, 4 pages, Latex file, No figures, Few changes

Scientific paper

10.1103/PhysRevLett.85.2845

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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