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arxiv: 1202.2307 · v2 · pith:IEKNWNTXnew · submitted 2012-02-10 · 🪐 quant-ph

Shot-noise limited monitoring and phase locking of the motion of a single trapped ion

classification 🪐 quant-ph
keywords motionphaselimitlimitedmonitoringquantumreal-timeresolution
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We perform high-resolution real-time read-out of the motion of a single trapped and laser-cooled Ba ion. By using an interferometric setup we demonstrate shot-noise limited measurement of thermal oscillations with resolution of 4 times the standard quantum limit. We apply the real-time monitoring for phase control of the ion motion through a feedback loop, suppressing the photon recoil-induced phase diffusion. Due to the spectral narrowing in phase-locked mode, the coherent ion oscillation is measured with resolution of about 0.3 times the standard quantum limit.

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