scholarly journals Laser cooling force in noisy quadrature of squeezed light

2006 ◽  
Vol 267 (1) ◽  
pp. 124-127 ◽  
Author(s):  
G.M. Saxena ◽  
Ashish Agarwal
Keyword(s):  
Laser Cooling ◽  
Squeezed Light ◽  
Cooling Force

scholarly journals Quantum enhanced feedback cooling of a mechanical oscillator using nonclassical light

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Clemens Schäfermeier ◽  
Hugo Kerdoncuff ◽  
Ulrich B. Hoff ◽  
Hao Fu ◽  
Alexander Huck ◽  
...  
Keyword(s):  
Feedback Control ◽  
Laser Cooling ◽  
Mechanical Oscillator ◽  
Fundamental Physics ◽  
Squeezed Light ◽  
Frequency Standards ◽  
Quantum Feedback ◽  
Consequent Reduction ◽  
Light Probe ◽  
Measurement Rate

Abstract Laser cooling is a fundamental technique used in primary atomic frequency standards, quantum computers, quantum condensed matter physics and tests of fundamental physics, among other areas. It has been known since the early 1990s that laser cooling can, in principle, be improved by using squeezed light as an electromagnetic reservoir; while quantum feedback control using a squeezed light probe is also predicted to allow improved cooling. Here we show the implementation of quantum feedback control of a micro-mechanical oscillator using squeezed probe light. This allows quantum-enhanced feedback cooling with a measurement rate greater than it is possible with classical light, and a consequent reduction in the final oscillator temperature. Our results have significance for future applications in areas ranging from quantum information networks, to quantum-enhanced force and displacement measurements and fundamental tests of macroscopic quantum mechanics.

Laser Cooling Mechanisms of Chromium Atomic Beam

2011 ◽  
Vol 189-193 ◽  
pp. 3768-3771
Author(s):  
Jing Huang ◽  
Bao Hua Zhu ◽  
Yuan Yuan Wu ◽  
Xi Huang
Keyword(s):  
Theoretical Investigation ◽  
Classical Theory ◽  
Laser Cooling ◽  
Atomic Beam ◽  
Optical Traps ◽  
Cooling Force

A theoretical investigation of 52Cr atomic beam in optical traps was reported, the Doppler and sub-Doppler laser cooling forces were discussed and some characteristics of these forces were shown based on the semi-classical theory. The simulative results indicate that the atomic beam can be collimated by these laser cooling forces, especially by sub-Doppler laser cooling force.

Interferometric Measurement with Squeezed Light.

1995 ◽  
Author(s):  
Hermann A. Haus ◽  
Karen Bergman ◽  
Luc Boivin
Keyword(s):  
Squeezed Light ◽  
Interferometric Measurement

Bright squeezed-light generation by a continuous-wave semimonolithic parametric amplifier

1996 ◽  
Vol 21 (17) ◽  
pp. 1396 ◽  
Author(s):  
K. Schneider ◽  
R. Bruckmeier ◽  
H. Hansen ◽  
S. Schiller ◽  
J. Mlynek
Keyword(s):  
Continuous Wave ◽  
Parametric Amplifier ◽  
Squeezed Light ◽  
Light Generation

scholarly journals Overcoming detection loss and noise in squeezing-based optical sensing

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Gaetano Frascella ◽  
Sascha Agne ◽  
Farid Ya. Khalili ◽  
Maria V. Chekhova
Keyword(s):  
Shot Noise ◽  
Optical Sensing ◽  
Detection Efficiency ◽  
Signal To Noise Ratio ◽  
Real Life ◽  
Squeezed States ◽  
Squeezed Light ◽  
Noise Limit ◽  
Imaging And Spectroscopy ◽  
Shot Noise Limit

AbstractAmong the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in imaging and spectroscopy, and are already used in real-life gravitational-wave detectors. But despite being more robust than other states, they are still very fragile, which narrows the scope of their application. In particular, squeezed states are useless in measurements where the detection is inefficient or the noise is high. Here, we experimentally demonstrate a remedy against loss and noise: strong noiseless amplification before detection. This way, we achieve loss-tolerant operation of an interferometer fed with squeezed and coherent light. With only 50% detection efficiency and with noise exceeding the level of squeezed light more than 50 times, we overcome the shot-noise limit by 6 dB. Sub-shot-noise phase sensitivity survives up to 87% loss. Application of this technique to other types of optical sensing and imaging promises a full use of quantum resources in these fields.

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