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We experimentally demonstrate a new scheme for the discrimination of binary-encoded optical coherent states. We show that the average error probability of our approach beats the ones obtained by standard receiver schemes for any signal amplitude.
We report an entanglement-based BBM92 quantum key distribution experiment using superconducting single photon detectors. A 16-kbit sifted key with a quantum bit error rate of 6.9 % was successfully generated after 100 km fiber transmission.
We present an analysis of the lineshape and strength of the fluorescence emitted by optically excited atoms and coupled to an optical fiber. We show the frequency-position selectivity and asymmetry of the spectral emission line. The theoretical analysis is compared with experimental data.
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