2016
DOI: 10.1103/physreva.94.033822
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Direct measurement of optical-trap-induced decoherence

Abstract: Thermal decoherence is a major obstacle to the realization of quantum coherence for massive mechanical oscillators. Although optical trapping has been used to reduce the thermal decoherence rate for such oscillators, it also increases the rate by subjecting the oscillator to stochastic forces resulting from the frequency fluctuations of the optical field, thereby setting a fundamental limit on the reduction. This is analogous to the noise penalty in an active feedback system. Here, we directly measure the reth… Show more

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Cited by 7 publications
(11 citation statements)
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References 43 publications
(51 reference statements)
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“…A few experiments involving displacement sensing of a mg-scale oscillator have been carried out so far in the field of the gravitational-wave detectors [24][25][26]. However, to the best of our knowledge, no experiment exists which has sufficient sensitivity to resolve the effect of gravity of the mg-and mm-scale.…”
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confidence: 99%
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“…A few experiments involving displacement sensing of a mg-scale oscillator have been carried out so far in the field of the gravitational-wave detectors [24][25][26]. However, to the best of our knowledge, no experiment exists which has sufficient sensitivity to resolve the effect of gravity of the mg-and mm-scale.…”
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confidence: 99%
“…( 1) for an integration time of one second. Our displacement sensor is an optical ring cavity with a movable planar end mirror, which was initially constructed for the purpose of realizing active feedback cooling of a movable mirror [26], based on the technology of gravitational-wave detectors [24]. All of the applications for active feedback cooling, measuring gravity, and measuring gravitational-waves rely on sensitive displacement measurements, and hence our approach is a top-down approach for both gravity measurements and quantum experiments.…”
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“…1 (a). Laser light enters the cavity and receives an intensity shift proportional to the mechanical position, which is read out via direct photo detection and fed back to the pendulum for cooling [40]. We analyze the following linearized Hamiltonian in a rotating frame at the laser frequency ω…”
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confidence: 99%
“…Main data in the time domain.-The main data was measured with an incident laser power of 30 mW and it is calibrated to displacement (the calibration factor is −2.3(4) × 10 −10 m/V) based on a transfer function analysis [36,40,44]. The cavity length was detuned from resonance such that the pendulum's resonance (ω m /2π) increases to 280 (7) Hz, leading to a mean value of the detuning of roughly 0.03 × κ or 1.2 × κ, because of the nonlinearity in Eq.…”
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confidence: 99%