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Conference Paper
Quantum Electronics and Laser Science Conference
San Jose, California United States
May 16-21, 2010
ISBN: 978-1-55752-889-6
Quantum Communication (QThI)

Witnessing Effective Entanglement over 2km of Optical Fiber

Christoffer Wittmann, Josef Fürst, Carlos Wiechers, Dominique Elser, Hauke Häseler, Norbert Lütkenhaus, and Gerd Leuchs


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We present a continuous-variable QKD system using heterodyne detection. We experimentally determine channel characteristics and compare them to bounds of our entanglement criterion. For the first time, the local oscillator is considered in this verification.

© 2010 The Optical Society

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.5570) Quantum optics : Quantum detectors
(270.5568) Quantum optics : Quantum cryptography

C. Wittmann, J. Fürst, C. Wiechers, D. Elser, H. Häseler, N. Lütkenhaus, and G. Leuchs, "Witnessing Effective Entanglement over 2km of Optical Fiber," in Conference on Lasers and Electro-Optics 2010, OSA Technical Digest (CD) (Optical Society of America, 2010), paper QThI4.

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