Atomic “bomb testing”: the Elitzur–Vaidman experiment violates the Leggett–Garg inequality

Robens, Carsten; Alt, Wolfgang; Emary, Clive; Meschede, Dieter; Alberti, Andrea

doi:10.1007/s00340-016-6581-y

Cited by 53 publications

(19 citation statements)

References 43 publications

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“…More recently this has been extended to individual atoms trapped by optical tweezers in free-space using single photon counters for state-selective fluorescence detection [6,7] and in statedependent optical lattices where the internal state are mapped onto the atom's position [8].…”

Section: Introductionmentioning

confidence: 99%

State-dependent fluorescence of neutral atoms in optical potentials

Martinez-Dorantes¹,

Alt²,

Gállego³

et al. 2018

Phys. Rev. A

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Recently we have demonstrated scalable, non-destructive, and high-fidelity detection of the internal state of 87 Rb neutral atoms in optical dipole traps using state-dependent fluorescence imaging [M. Martinez-Dorantes et al., PRL, 2017]. In this article we provide experimental procedures and interpretations to overcome the detrimental effects of heating-induced trap losses and state leakage. We present models for the dynamics of optically trapped atoms during state-dependent fluorescence imaging and verify our results by comparing Monte Carlo simulations with experimental data. Our systematic study of dipole force fluctuations heating in optical traps during near-resonant illumination shows that off-resonant light is preferable for state detection in tightly confining optical potentials.

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Section: Introductionmentioning

confidence: 99%

State-dependent fluorescence of neutral atoms in optical potentials

Martinez-Dorantes¹,

Alt²,

Gállego³

et al. 2018

Phys. Rev. A

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“…Is it possible to satisfy ESIT D(n 3 ) = 0; ∀n 3 and still violate Eq. (15)? We answer this question by considering a simple measurement scheme which we call an "inverted measurement".…”

Section: Inverted Measurements and A Quantum-optics Realisationmentioning

confidence: 99%

“…Thus this scheme offers a route to satisfy NSIT for both measurements, ESIT along with it, and still violate Eq. (15).…”

Section: Inverted Measurements and A Quantum-optics Realisationmentioning

confidence: 99%

Ambiguous measurements, signaling, and violations of Leggett-Garg inequalities

Emary

2017

Phys. Rev. A

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Ambiguous measurements do not reveal complete information about the system under test. Their quantum-mechanical counterparts are semi-weak (or in the limit, weak-) measurements and here we discuss their role in tests of the Leggett-Garg inequalities. We show that, whilst ambiguous measurements allow one to forgo the usual non-invasive measureability assumption, to derive an LGI that may be violated, we are forced to introduce another assumption that equates the invasive influence of ambiguous and unambiguous detectors. Based on this assumption, we derive signalling conditions that should be fulfilled for the plausibility of the Leggett-Garg test. We then propose an experiment on a three-level system with a direct quantum-optics realisation that satisfies all signalling constraints and violates a Leggett-Garg inequality.

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“…Experimental violations of macrorealism have been found in a variety of well-isolated optical and solid-state quantum systems; for a review, see [36] and subsequent experiments [24,35,[37][38][39]. However, inferences about the existence of quantum coherence drawn from such tests make implicit assumptions about the coupling of the system to its environment.…”

Section: Introductionmentioning

confidence: 99%

Subtleties of witnessing quantum coherence in nonisolated systems

et al. 2018

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Identifying non-classicality unambiguously and inexpensively is a long-standing open challenge in physics. The No-Signalling-In-Time protocol was developed as an experimental test for macroscopic realism, and serves as a witness of quantum coherence in isolated quantum systems by comparing the quantum state to its completely dephased counterpart. We show that it provides a lower bound on a certain resource-theoretic coherence monotone. We go on to generalise the protocol to the case where the system of interest is coupled to an environment. Depending on the manner of the generalisation, the resulting witness either reports on system coherence alone, or on a disjunction of system coherence with either (i) the existence of non-classical system-environment correlations or (ii) non-negligible dynamics in the environment. These are distinct failure modes of the Born approximation in non-isolated systems.

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Atomic “bomb testing”: the Elitzur–Vaidman experiment violates the Leggett–Garg inequality

Cited by 53 publications

References 43 publications

State-dependent fluorescence of neutral atoms in optical potentials

State-dependent fluorescence of neutral atoms in optical potentials

Ambiguous measurements, signaling, and violations of Leggett-Garg inequalities

Subtleties of witnessing quantum coherence in nonisolated systems

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