Quantum variation measurement of a force

Vyatchanin, S. P.; Zubova, E. A.

doi:10.1016/0375-9601(95)00280-g

Cited by 106 publications

(86 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been implemented experimentally by Herzberg et al [86] near the SQL. The variational approach of beating the SQL has later been adapted to broad-band detectors [66,65,37]. The stroboscopic approach [85] probes the position of an oscillator with pulses of measurements, separated by half period of oscillation.…”

Section: 42mentioning

confidence: 99%

“…However, a remarkably elegant scheme that relies on back-action evasion can be inspired by the variational measurement invented by Vyatchanin et al [65,66], who observed that if signal waveform is known, back-action evasion can be achieved if we measure a time-dependent optical quadrature. (For us, each mechanical oscillator quadrature basically corresponds to the signal having a particular phase.)…”

Section: Achieving Tomography and The Use Of Back-action Evasionmentioning

confidence: 99%

See 1 more Smart Citation

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

272

302

View full text Add to dashboard Cite

Abstract. Rapid experimental progress has recently allowed the use of light to prepare macroscopic mechanical objects into nearly pure quantum states. This research field of quantum optomechanics opens new doors toward testing quantum mechanics, and possibly other laws of physics, in new regimes. In the first part of this paper, I will review a set of techniques of quantum measurement theory that are often used to analyze quantum optomechanical systems. Some of these techniques were originally designed to analyze how a classical driving force passes through a quantum system, and can eventually be detected with optimal signal-to-noise ratio -while others focus more on the quantum state evolution of a mechanical object under continuous monitoring. In the second part of this paper, I will review a set of experimental concepts that will demonstrate quantum mechanical behavior of macroscopic objects -quantum entanglement, quantum teleportation, and the quantum Zeno effect. Taking the interplay between gravity and quantum mechanics as an example, I will review a set of speculations on how quantum mechanics can be modified for macroscopic objects, and how these speculations -and their generalizations -might be tested by optomechanics.

show abstract

Section: 42mentioning

confidence: 99%

Section: Achieving Tomography and The Use Of Back-action Evasionmentioning

confidence: 99%

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

272

302

View full text Add to dashboard Cite

show abstract

“…(8). These correlations can be negative and, if the measurement is sufficiently strong, they can reduce the homodyne noise below the shot noise level (a signature of having created a squeezed state of light), or they can improve signal-to-noise ratio in detection of external force acting on the oscillator (an example of quantum-enhanced force sensing [39] [32]. When restricting the frequency range of interest to around the mechanical resonance, dispersion of the loss angle can be safely neglected in most cases and the thermal noise be treated as white n th [Ω] ≈ n th [Ω m ].…”

Section: Discussion Of Implications For Broadband Quantum Optomechanicsmentioning

confidence: 99%

Evidence for structural damping in a high-stress silicon nitride nanobeam and its implications for quantum optomechanics

et al. 2018

View full text Add to dashboard Cite

We resolve the thermal motion of a high-stress silicon nitride nanobeam at frequencies far below its fundamental flexural resonance (3.4 MHz) using cavity-enhanced optical interferometry. Over two decades, the displacement spectrum is well-modeled by that of a damped harmonic oscillator driven by a 1/f thermal force, suggesting that the loss angle of the beam material is frequency-independent. The inferred loss angle at 3.4 MHz, φ = 4.5·10 −6 , agrees well with the quality factor (Q) of the fundamental beam mode (φ = Q −1 ). In conjunction with Q measurements made on higher order flexural modes, and accounting for the mode dependence of stress-induced loss dilution, we find that the intrinsic (undiluted) loss angle of the beam changes by less than a factor of 2 between 50 kHz and 50 MHz. We discuss the impact of such "structural damping" on experiments in quantum optomechanics, in which the thermal force acting on a mechanical oscillator coupled to an optical cavity is overwhelmed by radiation pressure shot noise. As an illustration, we show that structural damping reduces the bandwidth of ponderomotive squeezing.

show abstract

“…In that context, proper choice of detection angle cancels the back-action force in the measurement record -a technique termed variational measurement [339] (further elucidated in [94,95]). …”

Section: Quantum-enhanced Metrologymentioning

confidence: 99%

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

View full text Add to dashboard Cite

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 ...

show abstract

Quantum variation measurement of a force

Cited by 106 publications

References 4 publications

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Evidence for structural damping in a high-stress silicon nitride nanobeam and its implications for quantum optomechanics

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Contact Info

Product

Resources

About