Decoherence-Free Quantum Information Processing with Four-Photon Entangled States

Mohamed Bourennane, Manfred Eibl, Sascha Gaertner, Christian Kurtsiefer, Adán Cabello, and Harald Weinfurter
Phys. Rev. Lett. 92, 107901 – Published 9 March 2004

Abstract

Decoherence-free states protect quantum information from collective noise, the predominant cause of decoherence in current implementations of quantum communication and computation. Here we demonstrate that spontaneous parametric down conversion can be used to generate four-photon states which enable the encoding of one qubit in a decoherence-free subspace. The immunity against noise is verified by quantum state tomography of the encoded qubit. We show that particular states of the encoded qubit can be distinguished by local measurements on the four photons only.

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  • Received 22 August 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.107901

©2004 American Physical Society

Authors & Affiliations

Mohamed Bourennane1,2, Manfred Eibl1,2, Sascha Gaertner1,2, Christian Kurtsiefer2, Adán Cabello3, and Harald Weinfurter1,2

  • 1Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
  • 2Sektion Physik, Ludwig-Maximilians-Universität, D-80797 München, Germany
  • 3Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain

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Issue

Vol. 92, Iss. 10 — 12 March 2004

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