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Free keywords:
ELECTROMAGNETIC BEAM PROPAGATION; HIGH-FIDELITY TRANSMISSION; QUANTUM
KEY DISTRIBUTION; SINGLE-PHOTON DETECTORS; TURBULENT MEDIA; NOBEL
LECTURE; ENTANGLEMENT; STATES; PHASE; FIELDOptics; Physics;
Abstract:
We give a systematic theoretical description of homodyne detection in the case where both the signal and the local oscillator pass through the turbulent atmosphere. Imperfect knowledge of the local-oscillator amplitude is effectively included in a noisy density operator, leading to postprocessing noise. Alternatively, we propose a technique with monitored transmission coefficient of the atmosphere, which is free of postprocessing noise.
