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

Magnus Rådmark, Marcin Wieśniak, Marek Żukowski, and Mohamed Bourennane
Phys. Rev. A 80, 040302(R) – Published 5 October 2009
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Abstract

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.

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  • Received 13 March 2009

DOI:https://doi.org/10.1103/PhysRevA.80.040302

©2009 American Physical Society

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Protecting quantum superpositions from the outside world

Published 5 October 2009

An entangled state of six photons could potentially carry quantum information over large distances and between different reference frames.

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Authors & Affiliations

Magnus Rådmark1, Marcin Wieśniak2, Marek Żukowski2, and Mohamed Bourennane1

  • 1Physics Department, Stockholm University, SE-10691 Stockholm, Sweden
  • 2Institute for Theoretical Physics and Astrophysics, Uniwersytet Gdański, PL-80-952 Gdańsk, Poland

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Vol. 80, Iss. 4 — October 2009

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