Precise, super-resolving intensity measurement by quantum jump spectroscopy of a single neutral atom
arXiv (Cornell University)(2022)
摘要
We present precise, sub-wavelength optical intensity measurement using a
single trapped ^87Rb atom as a sensor. The intensity is measured by the
scalar ac Stark shift it produces on the F=1 → F'=2 hyperfine
transition of the D_2 line, chosen for its F' = F+1 structure and very
small tensor polarizability. To boost signal and reduce measurement-induced
perturbations, we use a quantum jump spectroscopy technique in which a single
absorbed photon on a transition of interest induces the scattering of hundreds
of photons on a bright closed transition. The method greatly reduces systematic
effects associated with the atomic state, optical polarization, probe power,
and atom heating, and gives the atomic temperature as a second spectroscopic
observable. We demonstrate the method by measuring the intensity at the focus
of an optical tweezer.
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关键词
quantum jump
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