Continuous quantum measurement and phase locking of a single trapped ion

Details Continuous quantum measurement and phase locking of a single trapped ion Continuous quantum measurement and phase locking of a single trapped ion

2012-02-10

arxiv.org/abs/1202.2307v1

Physics

Quantum Physics

Scientific paper

We perform high-resolution real time read-out of the quantum 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 also realize quantum limited phase control of the ion motion, suppressing the photon recoil-induced phase diffusion through a feedback loop. 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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