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Geometric phases for mixed states in interferometry
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Quantum Chemistry.
School of Informatics, Univ. of Wales, Bangor, UK .
Centre for Quantum Computation, Clarendon Laboratory, Univ. of Oxford, UK.
Dept. of Physics and Astronomy, Univ. of South Carolina, USA.
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2000 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 85, no 14, 2845-2849 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2000. Vol. 85, no 14, 2845-2849 p.
Keyword [en]
Geometric phase, mixed quantum states, quantum interferometry
National Category
Physical Sciences
Research subject
URN: urn:nbn:se:uu:diva-36875DOI: 10.1103/PhysRevLett.85.2845ISI: 000089581400001PubMedID: 11005950OAI: oai:DiVA.org:uu-36875DiVA: diva2:64774
Available from: 2007-02-06 Created: 2007-02-06 Last updated: 2011-10-05

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