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Strong Einstein-Podolsky-Rosen entanglement from a single squeezed light source

By Tobias Eberle, Vitus Händchen, Jörg Duhme, Torsten Franz, Reinhard F. Werner and Roman Schnabel

Abstract

Einstein-Podolsky-Rosen (EPR) entanglement is a criterion that is more demanding than just certifying entanglement. We theoretically and experimentally analyze the low resource generation of bi-partite continuous variable entanglement, as realized by mixing a squeezed mode with a vacuum mode at a balanced beam splitter, i.e. the generation of so-called vacuum-class entanglement. We find that in order to observe EPR entanglement the total optical loss must be smaller than 33.3 %. However, arbitrary strong EPR entanglement is generally possible with this scheme. We realize continuous wave squeezed light at 1550 nm with up to 9.9 dB of non-classical noise reduction, which is the highest value at a telecom wavelength so far. Using two phase controlled balanced homodyne detectors we observe an EPR co-variance product of 0.502 \pm 0.006 < 1, where 1 is the critical value. We discuss the feasibility of strong Gaussian entanglement and its application for quantum key distribution in a short-distance fiber network.Comment: 4 pages, 4 figure

Topics: Quantum Physics
Year: 2011
DOI identifier: 10.1103/PhysRevA.83.052329
OAI identifier: oai:arXiv.org:1103.1817
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