Oscillations of the purity in the repeated-measurement-based generation of quantum states

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

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Repeated observations of a quantum system interacting with another one can drive the latter toward a particular quantum state, irrespective of its initial condition, because of an effective nonunitary evolution. If the target state is a pure one, the degree of purity of the system approaches unity, even when the initial condition of the system is a mixed state. In this paper we study the behavior of the purity from the initial value to the final one, that is, unity. Depending on the parameters, after a finite number of measurements, the purity exhibits oscillations that brings about a lower purity than that of the initial state, which is a point to be taken care of in concrete applications.

本文言語English
論文番号042109
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
77
4
DOI
出版ステータスPublished - 2008 4月 16

ASJC Scopus subject areas

  • 原子分子物理学および光学

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