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

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons40444

Eberle,  Tobias
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40490

Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1103.1817
(Preprint), 279KB

PRA83_052329.pdf
(Any fulltext), 505KB

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Citation

Eberle, T., Händchen, V., Duhme, J., Franz, T., Werner, R. F., & Schnabel, R. (2011). Strong Einstein-Podolsky-Rosen entanglement from a single squeezed light source. Phys. Rev. A 83, 052329 (2011), 83(5): 052329. doi:10.1103/PhysRevA.83.052329.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-07E7-C
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.