Increasing entanglement between Gaussian states by coherent photon subtraction

Increasing entanglement between Gaussian states by coherent photon subtraction

We experimentally demonstrate that the entanglement between Gaussian entangled states can be increased by non-Gaussian operations. Coherent subtraction of single photons from Gaussian quadrature-entangled light pulses, created by a nondegenerate parametric amplifier, produces delocalized states with...

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Veröffentlicht in:Physical review letters 2007-01, Vol.98 (3), p.030502-030502, Article 030502
Hauptverfasser: Ourjoumtsev, Alexei, Dantan, Aurélien, Tualle-Brouri, Rosa, Grangier, Philippe
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Quantum Physics
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container_title Physical review letters
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creator Ourjoumtsev, Alexei
Dantan, Aurélien
Tualle-Brouri, Rosa
Grangier, Philippe
description We experimentally demonstrate that the entanglement between Gaussian entangled states can be increased by non-Gaussian operations. Coherent subtraction of single photons from Gaussian quadrature-entangled light pulses, created by a nondegenerate parametric amplifier, produces delocalized states with negative Wigner functions and complex structures more entangled than the initial states in terms of negativity. The experimental results are in very good agreement with the theoretical predictions.
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Quantum Physics
title Increasing entanglement between Gaussian states by coherent photon subtraction
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