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

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


研究成果: Article査読

11 被引用数 (Scopus)


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.

ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
出版ステータスPublished - 2007 10月 15

ASJC Scopus subject areas

  • 原子分子物理学および光学


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