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arXiv:1411.5812 · Physical Review A

Double-well atom trap for fluorescence detection at the Heisenberg limit

Ion Stroescu, David B. Hume, Markus K. Oberthaler

Published Jan 26, 2015• 16 citations
arXivHTMLPDF

Abstract

An atom-number detector capable of simultaneous detection of two mesoscopic ensembles of atoms with single-atom resolution is demonstrated, opening up prospects for Heisenberg-limited interferometry and metrology.
DOI
10.1103/physreva.91.013412

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The analysis of entangled atomic ensembles and their application for interferometry beyond the standard quantum limit requires an accurate determination of the number of atoms. We present an accurate fluorescence detection technique for atoms that is fully integrated into an experimental apparatus for the production of many-particle entangled quantum states. Single-particle resolving fluorescence measurements for 111 up to 303030 atoms are presented. According to our noise analysis, we extrapolate that the single-atom resolution extends to a limiting atom number of 390(20)390(20)390(20) atoms. We utilize the accurate atom number detection for a number stabilization of the laser-cooled atomic ensemble. For a target ensemble size of 777 atoms prepared on demand, we achieve a 92(2) %92(2)\,\%92(2)% preparation fidelity and reach number fluctuations 18(1) dB18(1)\,\mathrm{dB}18(1)dB below the shot noise level using real-time feedback on the magneto-optical trap.
Abstract The analysis of entangled atomic ensembles and their application for interferometry beyond the standard quantum limit requires an accurate determination of the number of atoms. We present an accurate fluorescence detection technique for atoms that is fully integrated into an experimental apparatus for the production of many-particle entangled quantum states. Number-resolved fluorescence measurements with single-atom accuracy for 1 up to 30 atoms are presented. According to our noise analysis, we extrapolate that the single-atom accuracy extends to a limiting atom number of 390(20) atoms. We utilize the accurate atom number detection for a number stabilization of the laser-cooled atomic ensemble. For a target ensemble size of 7 atoms prepared on demand, we achieve a 92(2)% preparation fidelity and reach number fluctuations 18(1) dB below the shot noise level using real-time feedback on the magneto-optical trap.
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