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Title	Back in Action
File	back-in-action_BTrV1.pdf
	back-in-action_iFRQj.mp3
Classification	FLAC 192 kHz
Time	52 min 41 seconds
Launched	4 years 10 months 10 days ago
File Size	1,110 KB
Number of Pages	194 Pages

Back in Action

Category: Mystery, Thriller & Suspense, Self-Help, Test Preparation
Author: Kate DiCamillo, Trevor Noah
Publisher: Kristin Hannah
Published: 2016-08-07
Writer: Marianne Williamson
Language: Japanese, Spanish, Hebrew, Chinese (Simplified), Polish
Format: Kindle Edition, pdf

Back-action evading measurement of the collective mode of a Bose-Einstein condensate - In this paper, we investigate theoretically the back-action evadingmeasurement of the collective mode of an interacting atomic Bose-Einsteincondensate (BEC) trapped in an optical cavity which is driven coherently by apump laser with a modulated amplitude. It is shown that for a specified kind ofamplitude modulation of the driving laser, one can measure a generalizedquadrature of the collective mode of the BEC indirectly through the outputcavity field with a negligible backaction noise in the good-cavity eless, the on-resonance added noise of measurement is suppressed belowthe standard quantum limit (SQL) even in the bad cavity limit. Moreover, themeasurement precision can be controlled through the s-wave scattering frequencyof atomic collisions.

Back action (quantum) - Wikipedia - (Quantum) back action refers (in the regime of quantum systems) to the effect of a detector on the measurement itself, as if the detector is not just making the ...

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Quantum back-action-evading measurement of motion in a negative ... - Jul 13, 2017 ... Abstract. Quantum mechanics dictates that a continuous measurement of the position of an object imposes a random quantum back-action (QBA) ...

Quantum back-action in measurements of zero-point mechanical oscillations - Measurement-induced back action, a direct consequence of the HeisenbergUncertainty Principle, is the defining feature of quantum measurements. We usequantum measurement theory to analyze the recent experiment of Safavi-Naeini etal. [Phys. Rev. Lett. \bf 108, 033602 (2012)], and show that results of thisexperiment not only characterize the zero-point fluctuation of anear-ground-state nanomechanical oscillator, but also demonstrate the existenceof quantum back-action noise --- through correlations that exist betweensensing noise and back-action noise. These correlations arise from the quantumcoherence between the mechanical oscillator and the measuring device, whichbuild up during the measurement process, and are key to improving sensitivitiesbeyond the Standard Quantum Limit.

Coenzyme A: back in action - PubMed - Coenzyme A (CoA) is a ubiquitous essential cofactor that plays a central role in the metabolism of carboxylic acids, including short- and long-chain fatty acids. In the last few years, all of the genes encoding the CoA biosynthetic enzymes have been identified and the structures of several proteins …

Quantum back action evading measurement of motion in a negative mass reference frame - Quantum mechanics dictates that a continuous measurement of the position ofan object imposes a random back action perturbation on its momentum. Thisrandomness translates with time into position uncertainty, thus leading to thewell known uncertainty on the measurement of motion. Here we demonstrate thatthe quantum back action on a macroscopic mechanical oscillator measured in thereference frame of an atomic spin oscillator can be evaded. The collectivequantum measurement on this novel hybrid system of two distant and disparateoscillators is performed with light. The mechanical oscillator is a drum modeof a millimeter size dielectric membrane and the spin oscillator is an atomicensemble in a magnetic field. The spin oriented along the field corresponds toan energetically inverted spin population and realizes an effective negativemass oscillator, while the opposite orientation corresponds to a positive massoscillator. The quantum back action is evaded in the negative mass setting andis enhanced in t

Measurement of quantum back action in the audio band at room ... - Mar 25, 2019 ... In order to observe quantum back action, we measure the cavity displacement noise at five cavity circulating powers of 10 mW, 73 mW, 110 mW, ...

Quantum Back-Action of an Individual Variable-Strength ... - Jan 11, 2013 ... The back-action on the qubit state of a single measurement of both signal quadratures was observed and shown to produce a stochastic ...

Definition of BACK ACTION - action reversing the usual or direct action… See the full definition

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