Geometric phases for mixed states in interferometry.

Geometric phases for mixed states in interferometry.

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 mi...

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Bibliografische gegevens
Hoofdauteurs: Sjöqvist, E, Pati, A, Ekert, A, Anandan, J, Ericsson, M, Oi, D, Vedral, V
Formaat: Journal article
Taal:English
Gepubliceerd in: American Inst of Physics 2000
Omschrijving
Samenvatting: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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