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

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2 Citazioni (Scopus)

Abstract

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.
Lingua originaleEnglish
pagine (da-a)042109-1-042109-5
Numero di pagine5
RivistaPHYSICAL REVIEW A
Volume77
Stato di pubblicazionePublished - 2008

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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