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Experimental filtering of two-, four-, and six-photon singlets from a single parametric down-conversion source

Source: Phys. Rev. A 80, 040302(R) (2009); doi:10.1103/PhysRevA.80.040302

Published 5 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.67.Mn
    Entanglement measures, witnesses, and other characterizations (quantum information)
  • 03.67.Bg
    Entanglement production and manipulation (quantum information)
  • 03.67.Pp
    Quantum error correction and other methods for protection against decoherence
  • YEAR: 2009
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PUBLICATION DATA
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Magnus Rådmark,1 Marcin Wieśniak,2 Marek Żukowski,2 and Mohamed Bourennane1
1Physics Department, Stockholm University, SE-10691 Stockholm, Sweden
2Institute for Theoretical Physics and Astrophysics, Uniwersytet Gdański, PL-80-952 Gdańsk, Poland
Invariant entangled states remain unchanged under simultaneous identical unitary transformations of all their subsystems. We experimentally generate and characterize such invariant two-, four-, and six-photon polarization entangled states. This is done only with a suitable filtering procedure of multiple emissions of entangled photon pairs from a single source without any interferometric overlaps. We get the desired states utilizing bosonic emission enhancement due to indistinguishability. The setup is very stable and gives high interference contrasts. Thus, the process is a very likely candidate for various photonic demonstrations of quantum information protocols. ©2009 The American Physical Society
History: Received 13 March 2009; revised 5 May 2009; published 5 October 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e040302

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