Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum information: Concepts and methods III

Q 41.2: Vortrag

Mittwoch, 20. März 2013, 14:30–14:45, E 214

Concept for a remote, balanced receiver for quantum key distribution — •Jan Gniesmer, Vitus Händchen, Tobias Eberle, and Roman Schnabel — Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstr. 38, 30167 Hannover, Germany

Entanglement-based continuous variable quantum key distribution networks rely on the efficient distribution and detection of quadrature entangled states. The distribution can be realized by coupling entangled states of light at 1550nm to optical fibers. This has been previously realized for squeezed states with high efficiency [Mehmet 2010]. In this talk I will present a scheme for distributing entangled states through 1km of fiber and measuring their quadrature amplitudes with balanced homodyne detection. This stand-alone receiver requires a phase lock of its local oscillator and polarization control of the distributed states.