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We present results from an optical communications testbed demonstrating polar coded pulse position modulation transmitted to a direct detection receiver. Using weak coherent states we achieve a photon information efficiency of 4.8 bits per received photon.
We describe a transceiver design for performing stealthy communication and target detection based on the continuous-variable nature of frequency entanglement that achieves improved detection sensitivity using weak signals in an environment of high background noise.
We consider the problem of demodulating M-ary optical PPM (pulse-position modulation) waveforms, and propose a structured receiver whose mean probability of symbol error is smaller than all known receivers, and approaches the quantum limit. The receiver uses photodetection coupled with optimized phase-coherent optical feedback control and a phase-sensitive parametric amplifier. We present a general...
We explore the potential of high-speed nanowire superconducting single-photon detectors for quantum key distribution in fiber, over long distances (at 1550 nm) and at high bit rates (at 850 nm).
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