Influence of dissipation on the extraction of quantum states via repeated measurements

B. Militello, K. Yuasa, H. Nakazato, A. Messina

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A quantum system put in interaction with another one that is repeatedly measured is subject to a nonunitary dynamics, through which it is possible to extract subspaces. This key idea has been exploited to propose schemes aimed at the generation of pure quantum states (purification). All such schemes have so far been considered in the ideal situations of isolated systems. In this paper, we analyze the influence of non-negligible interactions with environment during the extraction process, with the scope of investigating the possibility of purifying the state of a system in spite of the sources of dissipation. A general framework is presented and a paradigmatic example consisting of two interacting spins immersed in a bosonic bath is studied. The effectiveness of the purification scheme is discussed in terms of purity for different values of the relevant parameters and in connection with the bath temperature.

Original languageEnglish
Article number042110
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume76
Issue number4
DOIs
Publication statusPublished - 2007 Oct 15

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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