Measurement of radiation-pressure-induced optomechanical dynamics in a suspended Fabry-Perot cavity

Corbitt, T. R.; Ottaway, D. J.; Innerhofer, E.; Pelc, Jason S.; Mavalvala, N.

doi:10.1103/physreva.74.021802

Cited by 160 publications

(156 citation statements)

References 17 publications

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“…The reported limits of optical dilution so far are due to position sensing noise resulting from frequency fluctuations of the laser [10], the structural effect of the mechanical oscillator [2], and also parametric instability [5,[23][24][25]. Additionally, the reduction of thermal decoherence rate (i.e.…”

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confidence: 99%

Direct measurement of optical-trap-induced decoherence

et al. 2016

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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 rethermalizaton process for an initially cooled and optically trapped suspended mirror, and identify the current limiting decoherence rate as due to the optical trap. Our experimental study of the trap-induced decoherence rate will enable future advances in the probing of fundamental quantum mechanics in the bad cavity regime, such as testing of deformed commutators. Introduction.-Various types of optical potentials have been used to change the dynamics of mechanical systems, including atoms, thin membranes and suspended mirrors in order to, e.g. observe signatures of shot-noise radiation-pressure fluctuations [1], enhance the quality factor of the system [2], and improve the sensitivity of gravitational-wave detectors [3][4][5][6]. Since an optical potential works as an ideal spring for the trapped mode in terms of energy dissipation, it can reduce the number of quanta in the mode (the so-called "optical dilution" effect) so that even a low-frequency massive oscillator will exhibit quantum behavior [7]. Progress towards this quantum regime is underway [2,[8][9][10] in the field of cavity optomechanics [11] particularly in the bad cavity regime, where the optical linewidth is broader than that of the mechanical resonance. Although the bad cavity condition is often not promising in terms of coherence because of the slow mechanical oscillation, it enables us to detect gravitational-waves [12], and potentially to probe deformed commutators [13,14], generate entangled states [15][16][17], and test wavefunction collapse models [18][19][20][21][22].

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confidence: 99%

Direct measurement of optical-trap-induced decoherence

et al. 2016

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“…The various traces show the effect of the sideband resolution, 2Ω m κ , which dictates the efficiency of the autonomous feedback enforced by the cavity that leads to dynamic back-action. Such dynamic backaction on the mechanical oscillator leading to optical spring [198,199], linewidth narrowing (amplification) [200][201][202] or damping (cooling) [203][204][205][206][207] have been observed. In the resolvedsideband regime, characterised by κ Ω m , it becomes possible to cool the mechanical oscillator to a level where its energy is comparable to the energy in its ground state [208][209][210][211].…”

Section: Dynamical Back-actionmentioning

confidence: 99%

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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PAR Vivishek SUDHIR JOSEPH CONRAD, Heart of DarknessExperimental physics demands a certain degree of manual dexterity, the patience to tolerate the mundane, and an inexhaustible supply of optimism. Tobias hired me to work on an immensely sophisticated experiment despite any proof of my possessing these qualities; I am indebted to him for the belief he has placed in me. I would also like to acknowledge his dedication to fostering an environment where the pursuit of science is unencumbered by other worldly concerns. Stefan, Ewold and Samuel bore the brunt of a theorist trying to perform delicate experiments; the stern, yet encouraging, stewardship of this trio ensured that I enjoyed the culture shock. Dal Wilson was more than a colleague and a post-doc; his pragmatic approach to physics provided the ideal counter-point in our attempts to forge a deeper understanding of things ranging from vibration isolation to the subtleties of quantum mechanics. Without the patient efforts of Amir, Ryan and Hendrik in designing, fabricating, and testing of devices, none of the results reported here would have been possible. I hope I have been able to bequeath a better vision of the future of our experiment to Sergey. Conversations with Alexey, Daniel and Nathan have enabled me to vicariously learn how to measure microwave "photons". John Jost once taught me how to decorate a Christmas tree; since then he has imparted some wisdom on frequency metrology, and some on atomic physics. Together with Dal, Victor and Caroline have probably spent the most time with me outside the lab; it was fun to exercise an air of social normalcy with this bunch. Christophe has been an amazing sparring partner on every subject capable of being brought under scientific scrutiny.The personal space required for the pursuit of science comes through the sacrifice of many people. My family back home in India -parents, sister, grand-parents -have had to patiently wait for the brief interludes when I go home. No words can do justice to this and the very many other pleasures they have surrendered over the years for my sake. Before physics attracted me, I was charmed by someone else; I am lucky to have married her. Long time friends, mentorsAjith and Subeesh -have played pivotal roles in my being able to engage in physics; I hope to repay this enormous debt, some day.It was a privilege to have learnt from a few great teachers during my formative years. Their vision of an indelible unity in nature continues to motivate my study of physics. vii AbstractThe precision measurement of position has a long-standing tradition in physics. Cavendish's verification of the universal law of gravitation using a torsion pendulum, Perrin's confirmation of the atomic hypothesis via the precise measurement of the Brownian motion, and, the verification of the mechanical effect of electromagnetic radiation, all belong to this classical heritage. Quantum mechanics posits that the measurement of position results in an uncertain momentum; an idea developed to full maturity within the ...

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“…D. Blair with collaborators proposed valuable idea to heat the test masses in order to vary curvature radii of mirrors in interferometer and hence to control detuning and decrease overlapping factor between optical and acoustic modes [11,12,13]. Recently, the parametric instability effect was observed in experiment [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of parametric oscillatory instability in signal recycled LIGO interferometer

2007

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We present the analysis of undesirable effect of parametric oscillatory instability in signal recycled LIGO interferometer. The basis for this effect is the excitation of the additional (Stokes) optical mode, with frequency ω 1 , and the mirror elastic mode, with frequency ωm, when optical energy stored in the main FP cavity mode, with frequency ω 0 , exceeds the certain threshold and the frequencies are related as ω 0 ≃ ω 1 + ωm. We show that possibility of parametric instability in this interferometer is relatively small due to stronger sensitivity to detuning. We propose to "scan" the frequency range where parametric instability may take place varying the position of signal recycling mirror.

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Measurement of radiation-pressure-induced optomechanical dynamics in a suspended Fabry-Perot cavity

Cited by 160 publications

References 17 publications

Direct measurement of optical-trap-induced decoherence

Direct measurement of optical-trap-induced decoherence

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Analysis of parametric oscillatory instability in signal recycled LIGO interferometer

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