Near-Deterministic Discrimination of All Bell States with Linear Optics

Mladen Pavičić
Phys. Rev. Lett. 107, 080403 – Published 17 August 2011; Erratum Phys. Rev. Lett. 107, 219901 (2011); Retraction Phys. Rev. Lett. 109, 079902 (2012)

Abstract

This article has been retracted: see Phys. Rev. Lett. 109, 079902 (2012)

For a reliable implementation of quantum teleportation, a near-deterministic (close to 100%) discrimination of all four Bell states of entangled qubits is required. One can carry it out with linear optical elements only if conditional dynamics are allowed. Here we present a setup in which we repeatedly disentangle and reentangle photons in three of four states, so as to separate photons in one of them, conditioned on keeping the other two at bay. The efficiency of a realistic implementation of our setup with current technology is over 90% for an ideal source of photons on demand.

  • Figure
  • Figure
  • Received 27 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.080403

© 2011 American Physical Society

Errata

Authors & Affiliations

Mladen Pavičić*

  • Chair of Physics, Faculty of Civil Engineering, University of Zagreb, Zagreb 10001, Croatia and
  • Institute for Theoretical Atomic, Molecular and Optical Physics at Physics Department at Harvard University and Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA

  • *mpavicic@grad.hr

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Issue

Vol. 107, Iss. 8 — 19 August 2011

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