Toward quantum-limited position measurements using optically levitated microspheres

Libbrecht, K. G.; Black, E.

doi:10.1016/j.physleta.2003.12.022

Cited by 38 publications

(35 citation statements)

References 18 publications

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“…We monitor the position of the bead by measuring the deflection of one of the beams, which is split by a mirror with a sharp edge. This simple, yet novel, detection scheme has a bandwidth of 75 MHz and ultra-low noise [20,65]. The position signal of a trapped bead is recorded at a sampling rate of 2 MHz.…”

Section: Resultsmentioning

confidence: 99%

Brownian motion at short time scales

2013

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Brownian motion has played important roles in many different fields of science since its origin was first explained by Albert Einstein in 1905. Einstein's theory of Brownian motion, however, is only applicable at long time scales. At short time scales, Brownian motion of a suspended particle is not completely random, due to the inertia of the particle and the surrounding fluid. Moreover, the thermal force exerted on a particle suspended in a liquid is not a white noise, but is colored. Recent experimental developments in optical trapping and detection have made this new regime of Brownian motion accessible. This review summarizes related theories and recent experiments on Brownian motion at short time scales, with a focus on the measurement of the instantaneous velocity of a Brownian particle in a gas and the observation of the transition from ballistic to diffusive Brownian motion in a liquid.

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Section: Resultsmentioning

confidence: 99%

Brownian motion at short time scales

2013

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“…Pressures in the low 10 −14 Torr range have been reproducibly achieved in a 3m long vacuum chamber [41]. In our considerations, a conservative value is taken P = 10 −10 Torr, which is usually required for achieving ultrahigh-Q mechanical oscillators and the ultrasensitive measurements in the levitated optomechanical system [19,20,32,42,43]. Then we find γ i = 10 −7.8 Hz in the room-temperature gas, indicating that ideal oscillators can be essentially decoupled from their thermal environment.…”

Section: Forecasts and Constraintsmentioning

confidence: 99%

“…These systems can also be of considerable technological for improved measurements of displacements [19], forces [20] and masses [21]. Recently, the optical pump-probe technique has become a popular topic, which affords an effective way to investigate the light-matter interaction.…”

Section: Introductionmentioning

confidence: 99%

Cavity optomechanical spectroscopy constraints chameleon dark energy scenarios

Liu

Zhu

2018

Eur. Phys. J. C

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The chameleon scalar field is a matter-coupled dark energy candidate with the screening mechanisms. In the present paper,we propose a quantum cavity optomechanical scheme to detect the possible signature of chameleons via the optical pump-probe spectroscopy. Compare to the previous experiment the sensitivity can be improved by the using of electrostatic shield and a pump-probe scheme to read the weak frequency splitting. We expect that this work will be a useful addition to the current literature on proposals to detect effects of dark energy.

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“…This remarkable decoupling can be harnessed for cooling the center of mass motion of such objects to the quantum ground state [5][6][7][8]. These systems also have been considered in the context of reaching and exceeding the standard quantum limit of position measurement [9]. In addition, these techniques enable ultra-sensitive force detection [10][11][12] and extend the study of quantum coherence to the mesoscopic regime.…”

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confidence: 99%

Detecting High-Frequency Gravitational Waves with Optically Levitated Sensors

2013

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We propose a tunable resonant sensor to detect gravitational waves in the frequency range of 50 -300 kHz using optically trapped and cooled dielectric microspheres or micro-discs. The technique we describe can exceed the sensitivity of laser-based gravitational wave observatories in this frequency range, using an instrument of only a few percent of their size. Such a device extends the search volume for gravitational wave sources above 100 kHz by 1 to 3 orders of magnitude, and could detect monochromatic gravitational radiation from the annihilation of QCD axions in the cloud they form around stellar mass black holes within our galaxy due to the superradiance effect.PACS numbers: 04.80. Nn,95.55.Ym,14.80.Va Introduction. Over the past 40 years optical trapping of dielectric objects, both macroscopic and atomic, has made a profound impact in a wide range of fields ranging from fundamental physics to the life sciences. First studied by Ashkin and coworkers [1], optically trapped dielectrics in ultra-high vacuum become well decoupled from their room temperature environment [2][3][4][5][6]. Recent work suggests that the center of mass motion of such levitated objects can attain mechanical quality factors in excess of 10 12 , while internal vibrational modes are completely decoupled. This remarkable decoupling can be harnessed for cooling the center of mass motion of such objects to the quantum ground state [5][6][7][8]. These systems also have been considered in the context of reaching and exceeding the standard quantum limit of position measurement [9]. In addition, these techniques enable ultra-sensitive force detection [10][11][12] and extend the study of quantum coherence to the mesoscopic regime.

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Toward quantum-limited position measurements using optically levitated microspheres

Cited by 38 publications

References 18 publications

Brownian motion at short time scales

Brownian motion at short time scales

Cavity optomechanical spectroscopy constraints chameleon dark energy scenarios

Detecting High-Frequency Gravitational Waves with Optically Levitated Sensors

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