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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.22: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Quantifying effective entanglement in a continuous-variables QKD system — •Imran Khan^1,2, Christoffer Wittmann^1,2, Nitin Jain^1,2, Josef Fürst^1,2, Nathan Killoran³, Norbert Lütkenhaus³, Christoph Marquardt^1,2, and Gerd Leuchs^1,2 — ¹Max-Planck-Institute für die Physik des Lichts, Günther-Scharowsky-Str. 1, 91058 Erlangen — ²Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen — ³Institute for Quantum Computing, 200 University Ave. W.,Waterloo, ON N2L 3G1

We discuss a continuous-variables QKD system, where non-orthogonal coherent states are sent through a fiber-based quantum channel. The phase modulated signal is detected using simultaneous homodyne detection of conjugate quadratures. Evidence of quantum correlations in this raw data are a prerequisite for the production of a secure key. The quantum correlations can be modeled by effective entanglement. We have witnessed these correlations for a 2 km link. Our aim is to increase the channel length and quantify the effective entanglement.