Measurement scheme for purity based on two two-body gates

H. Nakazato, T. Tanaka, K. Yuasa, G. Florio, S. Pascazio

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two √swap gates and hinges only on measurements performed on a reference system, prepared in a certain pure state and coupled with the target system. Neither tomographic methods, with the complete reconstruction of the state, nor interferometric setups are needed.

Original languageEnglish
Article number042316
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume85
Issue number4
DOIs
Publication statusPublished - 2012 Apr 16

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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