Quantum jump photodetector for narrowband photon counting with a single atom

• URL: http://arxiv.org/abs/2403.08674v2
• Date: Mon, 07 Oct 2024 16:16:52 GMT
• Title: Quantum jump photodetector for narrowband photon counting with a single atom
• Authors: Laura Zarraoa, Romain Veyron, Tomas Lamich, Lorena C. Bianchet, Morgan W. Mitchell,
• Abstract summary: We demonstrate a single-photon quantum jump photodetector with intrinsically narrow bandwidth and strong rejection of out-of-band photons. We measure quantum efficiency of 2.9(2)$times 10-3$, a record for single-pass quantum jump production.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Using a single neutral 87Rb atom held in an optical trap, and "quantum jump" detection of single-photon-initiated state changes, we demonstrate a single-photon quantum jump photodetector (QJPD) with intrinsically narrow bandwidth and strong rejection of out-of-band photons, of interest for detecting weak optical signals in the presence of a strong broadband background. By analyzing fluorescence photon count distributions for the bright and dark states with and without excitation, we measure quantum efficiency of 2.9(2)$\times 10^{-3}$, a record for single-pass quantum jump production, and signal-photon-unprovoked "dark jump" rate - analogous to the dark count rate of other detectors - 3(10)$\times 10^{-3}$ jumps per second during passive accumulation plus 4.0(4)$\times 10^{-3}$ jumps per readout, orders of magnitude below those of traditional single-photon detectors. Available methods can substantially improve QJPD quantum efficiency, dark jump rate, bandwidth and tunability.

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