How to detect a possible correlation from the information of a subsystem in quantum-mechanical systems

Gen Kimura, Hiromichi Ohno, Hiroyuki Hayashi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The possibility of detecting correlations between two quantum-mechanical systems from only the information of a subsystem is investigated. For generic cases, we prove that there exist correlations between two quantum systems if the time derivative of the reduced purity is not zero. Therefore, an experimentalist can conclude that correlations between the system and some environment are nonzero if the time derivative of the reduced purity is found not to be zero. A quantitative estimation of the time derivative of the reduced purity with respect to correlations is also given. This clarifies the role of correlations in the mechanism of decoherence in open quantum systems.

Original languageEnglish
Article number042123
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume76
Issue number4
DOIs
Publication statusPublished - 2007 Oct 23
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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