Dresden 2011 – wissenschaftliches Programm
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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 Khan1,2, Christoffer Wittmann1,2, Nitin Jain1,2, Josef Fürst1,2, Nathan Killoran3, Norbert Lütkenhaus3, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 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.