Atomic systems using 85Rb Rydberg atoms and vapor provide primary measurements of blackbody radiation temperature near 130 GHz and 24.5 THz with uncertainties of 1% and 0.13 K respectively.
1979 Interactions of Blackbody Radiation with Atoms.Physical Review Letters42, 835–839
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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.
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Atomic and molecular systems for radiation thermometry
Atomic systems using 85Rb Rydberg atoms and vapor provide primary measurements of blackbody radiation temperature near 130 GHz and 24.5 THz with uncertainties of 1% and 0.13 K respectively.
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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.