We present an experimental quantum key distribution system with coherent light. Polarisation encoding ensures simple preparation and local oscillator free measurement. By postselection, a potential secret key can be established even in presence of losses>3dB.
© 2004 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4510) Fiber optics and optical communications : Optical communications
(270.0270) Quantum optics : Quantum optics
(270.5290) Quantum optics : Photon statistics
S. Lorenz, N. Lütkenhaus, U. L. Andersen, N. Korolkova, and G. Leuchs, "Quantum key distribution with coherent polarization states," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper ITuI28.
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