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
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.