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Measuring ion oscillations at the quantum level with fluorescence light

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arxiv 2009.14098 v1 pith:UUCPMTP2 submitted 2020-09-29 physics.atom-ph quant-ph

Measuring ion oscillations at the quantum level with fluorescence light

classification physics.atom-ph quant-ph
keywords atomlightmotionoscillationscoolingdemonstratedetectioninterference
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate an optical method for detecting the mechanical oscillations of an atom with single-phonon sensitivity. The measurement signal results from the interference between the light scattered by a single trapped atomic ion and that of its mirror image. The motion of the atom modulates the interference path length and hence the photon detection rate. We detect the oscillations of the atom in the Doppler cooling limit and reconstruct average trajectories in phase space. We demonstrate single-phonon sensitivity near the ground state of motion after EIT cooling. These results could be applied for motion detection of other light scatterers of fundamental interest, such as trapped nanoparticles.

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