Marzlin K-P, Ghose S, Sanders B C
Institute for Quantum Information Science, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
Phys Rev Lett. 2004 Dec 31;93(26 Pt 1):260402. doi: 10.1103/PhysRevLett.93.260402. Epub 2004 Dec 20.
In an open system, the geometric phase should be described by a distribution. We show that a geometric phase distribution for open system dynamics is in general ambiguous, but the imposition of reasonable physical constraints on the environment and its coupling with the system yields a unique geometric phase distribution that applies even for mixed states, nonunitary dynamics, and noncyclic evolutions.
在开放系统中,几何相位应由一种分布来描述。我们表明,开放系统动力学的几何相位分布通常是不明确的,但对环境及其与系统的耦合施加合理的物理约束会产生一种独特的几何相位分布,该分布甚至适用于混合态、非酉动力学和非循环演化。