Geometric phases for mixed states in interferometry

被引：486

作者：

Sjöqvist, E

Pati, AK

Ekert, A

Anandan, JS

Ericsson, M

Oi, DKL

Vedral, V

机构：

[1] Uppsala Univ, Dept Quantum Chem, SE-75120 Uppsala, Sweden

[2] Univ Wales, Sch Informat, Bangor LL57 1UT, Gwynedd, Wales

[3] Bhabha Atom Res Ctr, Div Theoret Phys, Bombay 400085, Maharashtra, India

[4] Univ Oxford, Clarendon Lab, Ctr Quantum Computat, Oxford OX1 3PU, England

[5] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.85.2845

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：2845 / 2849

页数：5

共 25 条

[1] PHASE-CHANGE DURING A CYCLIC QUANTUM EVOLUTION [J].