Preparation of distilled and purified continuous variable entangled states

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dc.creatorHage, Boris
dc.creatorSamblowski, Aiko
dc.creatorDiGuglielmo, James
dc.creatorFranzen, Alexander
dc.creatorFiurasek, Jaromir
dc.creatorSchnabel, Roman
dc.date2008-12-03
dc.date.accessioned2026-07-07T12:08:48Z
dc.date.available2026-07-07T12:08:48Z
dc.descriptionThe distribution of entangled states of light over long distances is a major challenge in the field of quantum information. Optical losses, phase diffusion and mixing with thermal states lead to decoherence and destroy the non-classical states after some finite transmission-line length. Quantum repeater protocols, which combine quantum memory, entanglement distillation and entanglement swapping, were proposed to overcome this problem. Here we report on the experimental demonstration of entanglement distillation in the continuous-variable regime. Entangled states were first disturbed by random phase fluctuations and then distilled and purified using interference on beam splitters and homodyne detection. Measurements of covariance matrices clearly indicate a regained strength of entanglement and purity of the distilled states. In contrast to previous demonstrations of entanglement distillation in the complementary discrete-variable regime, our scheme achieved the actual preparation of the distilled states, which might therefore be used to improve the quality of downstream applications such as quantum teleportation.
dc.identifierhttps://arxiv.org/abs/0812.0738
dc.identifierhttp://arxiv.org/abs/0812.0738
dc.identifierNature Physics 4, 915 - 918 (2008)
dc.identifierdoi:10.1038/nphys1110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/209448
dc.subjectQuantum Physics
dc.titlePreparation of distilled and purified continuous variable entangled states
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