Kinematic Approach to the Mixed State Geometric Phase in Nonunitary Evolution

Quantum Physics 550 0103 physical sciences FOS: Physical sciences Quantum Physics (quant-ph) 530 01 natural sciences
DOI: 10.1103/physrevlett.93.080405 Publication Date: 2004-08-21T02:10:32Z
ABSTRACT
A kinematic approach to the geometric phase for mixed quantal states in nonunitary evolution is proposed. This phase is manifestly gauge invariant and can be experimentally tested in interferometry. It leads to well-known results when the evolution is unitary.<br/>Minor changes; journal reference added<br/>
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