Experimental study of a Back Action Evading device for continuos measurements on a macroscopic harmonic oscillator at the quantum limit level

1997 ◽  
Vol 64 (2) ◽  
pp. 145-151 ◽  
Author(s):  
E. Majorana , ◽  
P. Puppo ◽  
P. Rapagnani ◽  
F. Ricci
Keyword(s):  
Experimental Study ◽  
Harmonic Oscillator ◽  
Quantum Limit ◽  
Back Action

Optomechanics and Quantum Measurement

2020 ◽  
pp. 183-236
Author(s):  
Aashish A. Clerk
Keyword(s):  
Quantum Measurement ◽  
Linear Response ◽  
Quantum Limit ◽  
Langevin Equations ◽  
Driven Cavity ◽  
Cavity System ◽  
Back Action ◽  
Quantum Optomechanics ◽  
Optomechanical Cavity

After a quick review of the basic theory of quantum optomechanical systems, based largely on linearized Heisenberg–Langevin equations, this chapter focuses on selected topics related to quantum measurement and quantum optomechanics. Included are: a comprehensive discussion of the quantum limit on the added noise of a continuous position detector, following the quantum linear response approach; a detailed discussion of the role of noise correlations, and how these can be achieved in an optomechanical cavity (by using squeezed input light, or by modifying the choice of measured output quadrature); and a discussion of back-action evading measurements of a mechanical quadrature, discussing how this can be achieved in a two-tone driven cavity system. The chapter ends with a quick introduction to the theory of conditional continuous quantum measurement, and a discussion on how a back-action evading measurement can be used to produce conditional mechanical squeezed states.

scholarly journals Experimental study of work fluctuations in a harmonic oscillator

2007 ◽  
Vol 8 (5-6) ◽  
pp. 518-527 ◽  
Author(s):  
Sylvain Joubaud ◽  
Nicolas B. Garnier ◽  
Frédéric Douarche ◽  
Artyom Petrosyan ◽  
Sergio Ciliberto
Keyword(s):  
Experimental Study ◽  
Harmonic Oscillator

Electrical harmonic oscillator with MR damper and energy harvester operating as TMD: Experimental study

Mechatronics ◽  
2020 ◽  
Vol 66 ◽  
pp. 102324 ◽  
Author(s):  
Bogdan Sapiński ◽  
Łukasz Jastrzębski ◽  
Janusz Gołdasz
Keyword(s):  
Experimental Study ◽  
Harmonic Oscillator ◽  
Energy Harvester ◽  
Mr Damper

Quantum measurement

Quantum 20/20 ◽  
2019 ◽  
pp. 181-200
Author(s):  
Ian R. Kenyon
Keyword(s):  
Gravitational Waves ◽  
Quantum Measurement ◽  
Input Port ◽  
Quantum Limit ◽  
Photon Flux ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Back Action

Heisenberg’s back action and Robertson’s intrinsic uncertainty are presented. von Neumann’s analysis of quantum measurement is recounted. Advanced LIGO is used as an example of quantum measurement: giant Michelson interferometers achieve sensitivity to motion of 1 part in 1021. The discovery at LIGO of gravitational waves is outlined. Then the standard quantum limit is deduced. The use of cavities in the interferometer arms to increase the photon flux is described. The potential for improvement by squeezing the vacuum at the blank input port is discussed. Prospects for speed interferometry are outlined.

Signal-to-noise ratio analysis for a back-action-evading measurement on a double harmonic oscillator

1994 ◽  
Vol 50 (6) ◽  
pp. 3596-3607 ◽  
Author(s):  
C. Cinquegrana ◽  
E. Majorana ◽  
N. Pergola ◽  
P. Puppo ◽  
P. Rapagnani ◽  
...  
Keyword(s):  
Harmonic Oscillator ◽  
Signal To Noise Ratio ◽  
Ratio Analysis ◽  
Signal To Noise ◽  
Back Action ◽  
Noise Ratio

scholarly journals Reduced spin measurement back-action for a phase sensitivity ten times beyond the standard quantum limit

2014 ◽  
Vol 8 (9) ◽  
pp. 731-736 ◽  
Author(s):  
J. G. Bohnet ◽  
K. C. Cox ◽  
M. A. Norcia ◽  
J. M. Weiner ◽  
Z. Chen ◽  
...  
Keyword(s):  
Quantum Limit ◽  
Phase Sensitivity ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Back Action

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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