Single rubidium atom as quantum jump photodetector counts laser photons in 10^10 photons/s sunlight, matches rate-equation model, and achieves 0.5 bits per symbol in noisy channel with 150 probe photons per 10 ms against 1 nW sunlight.
Holevo ,\ title title Quantum channel capacities , \ 10.1070/QEL17285 journal journal Quantum Electronics \ volume 50 ,\ pages 440 ( year 2020 ) NoStop
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Detection of photon-level signals embedded in sunlight with an atomic photodetector
Single rubidium atom as quantum jump photodetector counts laser photons in 10^10 photons/s sunlight, matches rate-equation model, and achieves 0.5 bits per symbol in noisy channel with 150 probe photons per 10 ms against 1 nW sunlight.