Weak-value amplification of light deflection by a dark atomic ensemble

Zhou, Lan; Turek, Yusuf; Sun, C. P.; Nori, Franco

doi:10.1103/physreva.88.053815

Cited by 44 publications

(29 citation statements)

References 30 publications

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“…After first optical implementation of weak value [4], it has been applied in different fields to observe very tiny effects, such as beam deflection [5][6][7][8][9][10], frequency shifts [11], phase shifts [12], angular shifts [13,14], velocity shifts [15], and even temperature shift [16]. Weak value has a nature of being a complex number, which lead the weak measurements to provide an ideal method to examine some fundamentals of quantum physics.…”

Section: Introductionmentioning

confidence: 99%

Advantages of nonclassical pointer states in postselected weak measurements

et al. 2015

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We investigate, within the weak measurement theory, the advantages of non-classical pointer states over semi-classical ones for coherent, squeezed vacuum, and Schröinger cat states. These states are utilized as pointer state for the system operatorÂ with propertyÂ 2 =Î, whereÎ represents the identity operator. We calculate the ratio between the signal-to-noise ratio (SNR) of non-postselected and postselected weak measurements. The latter is used to find the quantum Fisher information for the above pointer states. The average shifts for those pointer states with arbitrary interaction strength are investigated in detail. One key result is that we find the postselected weak measurement scheme for non-classical pointer states to be superior to semi-classical ones. This can improve the precision of measurement process.

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Section: Introductionmentioning

confidence: 99%

Advantages of nonclassical pointer states in postselected weak measurements

et al. 2015

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“…A peculiar feature of weak measurements is that information can be read out from the system, albeit the disturbance is reduced [30][31][32]. The method compromises the precision of the measurement.…”

Section: Sequential Weak Measurementsmentioning

confidence: 98%

Testing Bell’s inequality with one-party weak measurements

Bernardo

2015

Quantum Inf Process

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Bell's theorem is one of the most profound scientific discoveries ever made, namely the one which establishes a departure of the nondeterministic quantum mechanical predictions from our local realistic view of the world. In essence, based on Einstein's locality conditions, the theorem settles an experimentally verifiable constraint (Bell's inequality) on the statistical correlations between the observables of spatially separated pairs of entangled particles. Here, based on the notion of sequential weak measurements, we propose a framework to test Bell's inequality in a bipartite system with only local operations made by one of the parties. This novel scenario represents a great simplification of the problem, in the sense that only one of the particles of an entangled pair is required to be manipulated and detected. The importance of the use of pointer states endowed with orbital angular momentum in the present case is also demonstrated .

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“…The first experimental realization of the procedure proposed by AAV was performed using an optical setup [37], following a proposed scheme given in [38]. The fact that the weak value may lie far outside the range of an observable's eigenvalues has been found to be useful as a technique aimed at amplifying weak signal [39][40][41][42][43][44][45]. A review focusing on significant amplification of the pointer deflection is given in [46], where in addition a non-perturbative theory of weak pre-and post-selected measurements is presented.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Fundamental Features of Quantum Dynamics Studied in Matter-Wave Interferometry—Spin Weak Values and the Quantum Cheshire-Cat

Sponar

Denkmayr

Geppert

et al. 2016

Atoms

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Abstract:The validity of quantum-mechanical predictions has been confirmed with a high degree of accuracy in a wide range of experiments. Although the statistics of the outcomes of a measuring apparatus have been studied intensively, little has been explored and is known regarding the accessibility of quantum dynamics. For these sorts of fundamental studies of quantum mechanics, interferometry using neutron matter-waves in particular, provides almost ideal experimental circumstances. In this device quantum interference between spatially separated beams occurs on a macroscopic scale. Recently, the full determination of weak-values of neutrons 1 /2 -spin adds a new aspect to the study of quantum dynamics. Moreover, a new counter-intuitive phenomenon, called quantum Cheshire Cat, is observed in an interference experiment. In this article, we present an overview of these experiments.

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Weak-value amplification of light deflection by a dark atomic ensemble

Cited by 44 publications

References 30 publications

Advantages of nonclassical pointer states in postselected weak measurements

Advantages of nonclassical pointer states in postselected weak measurements

Testing Bell’s inequality with one-party weak measurements

Fundamental Features of Quantum Dynamics Studied in Matter-Wave Interferometry—Spin Weak Values and the Quantum Cheshire-Cat

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