Assessing Non-Markovian Quantum Dynamics

被引：503

作者：

Wolf, M. M. ^{[1
,2
]}

Eisert, J. ^{[3
,4
]}

Cubitt, T. S. ^{[5
]}

Cirac, J. I. ^{[1
]}

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[3] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[4] Univ London Imperial Coll Sci Technol & Med, London SW7 2PE, England

[5] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.101.150402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate what a snapshot of a quantum evolution-a quantum channel reflecting open system dynamics-reveals about the underlying continuous time evolution. Remarkably, from such a snapshot, and without imposing additional assumptions, it can be decided whether or not a channel is consistent with a time (in)dependent Markovian evolution, for which we provide computable necessary and sufficient criteria. Based on these, a computable measure of "Markovianity" is introduced. We discuss how the consistency with Markovian dynamics can be checked in quantum process tomography. The results also clarify the geometry of the set of quantum channels with respect to being solutions of time (in)dependent master equations.

引用

页数：4

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