Proposal for a Quantum Delayed-Choice Experiment

Ionicioiu, Radu; Terno, Daniel R.

doi:10.1103/physrevlett.107.230406

Cited by 182 publications

(305 citation statements)

References 22 publications

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“…Similarly, in a YDS experiment with single electrons, WWI is obtainable by placing the electron counter close to one of the slits [91]. Further, WWI is trivially available for an MZI with the beam merger removed [77] as depicted in Fig. 3.…”

Section: The Open Interferometer Configuration: Particlelike Statisticsmentioning

confidence: 99%

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An Approach To “Quantumness” In Coherent Control

Scholak

Brumer

2017

Advances in Chemical Physics

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Developments in the foundations of quantum mechanics have identified several attributes and tests associated with the "quantumness" of systems, including entanglement, nonlocality, quantum erasure, Bell test, etc.. Here we introduce and utilize these tools to examine the role of quantum coherence and nonclassical effects in 1 vs. N photon coherent phase control, a paradigm for an all-optical method for manipulating molecular dynamics. In addition, truly quantum control scenarios are introduced and examined. The approach adopted here serves as a template for studies of the role of quantum mechanics in other coherent control and optimal control scenarios.

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Section: The Open Interferometer Configuration: Particlelike Statisticsmentioning

confidence: 99%

“…The choice can be made even well after detecting the output from the CCI. Below, we exploit the CCI to design a novel coherent control implementation of "quantum delayed choice" [77] that has thus far only been observed in experiments with photons [51,78,79] and nuclear spins [80,81] (Sec. 5).…”

Section: A General Overview Of This Articlementioning

confidence: 99%

An Approach To “Quantumness” In Coherent Control

Scholak

Brumer

2017

Advances in Chemical Physics

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“…2. There, a coherent state is reflected off a quantum mirror (similar to a quantum beam splitter [15]). The mirror location is located in one of two positions, separated by a distance d, and described by states |+ , |− .…”

Section: Cavity Qed Interactionmentioning

confidence: 99%

Heisenberg scaling with weak measurement: a quantum state discrimination point of view

Jordan¹,

Tollaksen²,

Troupe³

et al. 2015

Quantum Stud.: Math. Found.

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We examine the results of the paper "Precision metrology using weak measurements" (Zhang et al. arXiv:1310.5302, 2013) from a quantum state discrimination point of view. The Heisenberg scaling of the photon number for the precision of the interaction parameter between coherent light and a spin one-half particle (or pseudospin) has a simple interpretation in terms of the interaction rotating the quantum state to an orthogonal one. To achieve this scaling, the information must be extracted from the spin rather than from the coherent state of light, limiting the applications of the method to phenomena such as cross-phase modulation. We next investigate the effect of dephasing noise and show a rapid degradation of precision, in agreement with general results in the literature concerning Heisenberg scaling metrology. We also demonstrate that a von Neumann-type measurement interaction can display a similar effect with no system/meter entanglement.

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“…Our starting point is a recent theoretical proposal [14] of a delayed choice experiment based on a quantum-controlled beamsplitter, which can be in a superposition of present and absent. Hence, the interferometer can be simultaneously closed and open, thus testing both the wave and the particle behaviour of the photon at the same time.…”

mentioning

confidence: 99%

“…Here, using a reconfigurable integrated quantum photonic circuit [15], we implement an interferometer featuring such a quantum beam-splitter, observing continuous morphing between wave and particle behaviour [14]. We point out however that this morphing behaviour can be reproduced by a simple classical model, and note that this loophole also plagues both the theoretical proposal of [14] as well as two of its recent NMR implementations [16,17]. In order to overcome this issue, we then present and experimentally demonstrate a quantum delayed choice scheme arXiv:1205.4926v2 [quant-ph]…”

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confidence: 99%

A Quantum Delayed-Choice Experiment

Shadbolt¹

2015

Complexity and Control in Quantum Photonics

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Quantum systems exhibit particle-like or wave-like behaviour depending on the experimental apparatus they are confronted by. This wave-particle duality is at the heart of quantum mechanics, and is fully captured in Wheeler's famous delayed choice gedanken experiment. In this variant of the double slit experiment, the observer chooses to test either the particle or wave nature of a photon after it has passed through the slits. Here we report on a quantum delayed choice experiment, based on a quantum controlled beam-splitter, in which both particle and wave behaviours can be investigated simultaneously. The genuinely quantum nature of the photon's behaviour is tested via a Bell inequality, which here replaces the delayed choice of the observer. We observe strong Bell inequality violations, thus showing that no model in which the photon knows in advance what type of experiment it will be confronted by, hence behaving either as a particle or as wave, can account for the experimental data.Quantum mechanics predicts with remarkable accuracy the result of experiments involving small objects, such as atoms and photons. However, when looking more closely at these predictions, we are forced to admit that they defy our intuition. Indeed, quantum mechanics tells us that a single particle can be in several places at the same time, and that distant entangled particles behave as a single physical object no matter how far apart they are [1].In trying to grasp the basic principles of the theory, in particular to understand more intuitively the behaviour of quantum particles, some of its pioneers introduced the notion of wave-particle duality [2]. A quantum system, for instance a photon, may behave either as a particle or a wave. However, the way in which it behaves depends on the kind of experimental apparatus with which it is measured. Hence, both aspects, particle and wave, which appear to be incompatible, are never observed simultaneously [3]. This is the notion of complementarity in quantum mechanics [4,5], which is central in the standard Copenhagen interpretation, and has been intensely debated in the past.In an effort to reconcile quantum predictions and common sense, it was suggested that quantum particles may in fact know in advance to which experiment they will be confronted, via a hidden variable, and could thus decide which behaviour to exhibit. This simplistic argument was however challenged by Wheeler in his elegant 'delayed choice' arrangement [6][7][8]. In this gedanken experiment, sketched in Fig. 1(a), a quantum particle is sent towards a Mach-Zender interferometer. The relative phase ϕ between the two arms of the interferometer can be adjusted such that the particle will emerge in output D 0 with certainty. That is, the interference is fully constructive in output D 0 , and fully destructive in output D 1 . This measurement thus clearly highlights the wave aspect of the quantum particle. However, the observer performing the experiment has the choice of modifying the above experiment, in particular by removing ...

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Proposal for a Quantum Delayed-Choice Experiment

Cited by 182 publications

References 22 publications

An Approach To “Quantumness” In Coherent Control

An Approach To “Quantumness” In Coherent Control

Heisenberg scaling with weak measurement: a quantum state discrimination point of view

A Quantum Delayed-Choice Experiment

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