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Gaussian Entanglement for Quantum Key Distribution from a Single-Mode Squeezing 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/persons40458

Händchen,  Vitus
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)

1110.3977
(Preprint), 618KB

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Citation

Eberle, T., Händchen, V., Duhme, J., Franz, T., Werner, R. F., & Schnabel, R. (2013). Gaussian Entanglement for Quantum Key Distribution from a Single-Mode Squeezing Source. New Journal of Physics, 15: 053049. doi:10.1088/1367-2630/15/5/053049.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-E9E3-8
Abstract
We report the realization of an Einstein-Podolsky-Rosen (EPR) entanglement source for gaussian continuous-variable quantum key distribution at 1550 nm. Our source is based on a single continuous-wave squeezed vacuum mode with 11.1 \pm 0.1 dB squeezing, combined with vacuum at a balanced beam splitter. The conditional variance product (Reid criterion, Phys. Rev. A 40 913, 1989) of this source is 0.31 \pm 0.01, well below the classical threshold 1. The maximal achievable key rate with security against collective attacks is of 0.38 bits/measurement. Although only a single squeezed beam was used, the conditional variance product is comparable to the best reported values using two squeezed beams.