Increasing identical particle entanglement by fuzzy measurements

D. Cavalcanti, M. França Santos, M. O. Terra Cunha, C. Lunkes, and V. Vedral
Phys. Rev. A 72, 062307 – Published 6 December 2005

Abstract

We investigate the effects of fuzzy measurements on spin entanglement for identical particles, both fermions and bosons. We first consider an ideal measurement apparatus and define operators that detect the symmetry of the spatial and spin part of the density matrix as a function of particle distance. Then, moving on to realistic devices that can only detect the position of the particle to within a certain spread, it was surprisingly found that the entanglement between particles increases with the broadening of detection.

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  • Received 28 April 2005

DOI:https://doi.org/10.1103/PhysRevA.72.062307

©2005 American Physical Society

Authors & Affiliations

D. Cavalcanti1,*, M. França Santos1,†, M. O. Terra Cunha2,‡, C. Lunkes3,§, and V. Vedral4,5,∥

  • 1Departamento de Física, CP 702, Universidade Federal de Minas Gerais, 30123-970, Belo Horizonte, MG, Brazil
  • 2Departamento de Matemática, CP 702, Universidade Federal de Minas Gerais, 30123-970, Belo Horizonte, MG, Brazil
  • 3QOLS, Blackett Laboratory, Imperial College London, London SW7 2BZ, England
  • 4Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Vienna, Austria
  • 5The School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, England

  • *Electronic address: dcs@fisica.ufmg.br
  • Electronic address: msantos@fisica.ufmg.br
  • Electronic address: tcunha@mat.ufmg.br
  • §Electronic address: christian.lunkes@ic.ac.uk
  • Electronic address: v.vedral@leeds.ac.uk

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Issue

Vol. 72, Iss. 6 — December 2005

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