A Quantum Delayed-Choice Experiment

Peruzzo, Alberto; Shadbolt, Peter; Brunner, Nicolás; Popescu, Sandu; O'Brien, Jeremy L.

doi:10.1126/science.1226719

Cited by 256 publications

(264 citation statements)

References 35 publications

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“…Further, the complementarity relation has been extended to the more general case of an asymmetric interferometer where only a single output port is considered and this duality holds [11]. Recently, the duality relation has also been investigated in the presence of non-locality [12] and quantum entanglement [13].…”

Section: Introductionmentioning

confidence: 99%

Duality of quantum coherence and path distinguishability

et al. 2015

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We derive a generalized wave-particle duality relation for arbitrary multi-path quantum interference phenomena. Beyond the conventional notion of the wave nature of a quantum system, i.e., the interference fringe visibility, we introduce a novel quantifier as the normalized quantum coherence, recently defined in the framework of quantum information theory. To witness the particle nature, we quantify the path distinguishability or the which-path information based on unambiguous quantum state discrimination. Then, the Bohr complementarity principle, for multi-path quantum interference, can be stated as a duality relation between the quantum coherence and the path distinguishability. For two-path interference, the quantum coherence is identical to the interference fringe visibility, and the relation reduces to the well-know complementarity relation. The new duality relation continues to hold in the case where mixedness is introduced due to possible decoherence effects.

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Section: Introductionmentioning

confidence: 99%

Duality of quantum coherence and path distinguishability

et al. 2015

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“…With all the specific attributes of photoelectron spin control, however, repeating such a success would be expremely difficult. Furthermore, we could have discussed far simpler examples of quantum erasure [103,105,145], delayed choice [102,[146][147][148], and quantum delayed choice [51,78,79], based on established technology like linear quantum optics that is used routinely in applications of quantum information theory. Indeed, we do not propose photoelectron spin control to show that quantum erasure and quantum delayed choice are possible or to provide further evidence that nature violates local realism.…”

Section: Facing the Loopholesmentioning

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%

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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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“…spintronics [1,2], quantum computing [3][4][5][6], nanometrology [7][8][9][10][11][12][13][14][15][16][17][18], biosensing [19][20][21], and experimental validation of foundations of quantum mechanics [18,22]. Among these systems, point defects in crystalline materials form the tiniest ones.…”

Section: Introductionmentioning

confidence: 99%

Two-site diamond-like point defects as new single-photon emitters

Bodrog

Gali

2014

EPJ Web of Conferences

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Abstract. In this small review, we recall two promising candidates for biomarker nanosystems, in which a two-site defect embedded in a diamond-like lattice makes a single-photon source. The two candidates are the silicon-vacancy defect in diamond, and the carbon antisite-vacancy pair in 4H silicon carbide. These defects, which by symmetry resemble to the famous nitrogen-vacancy defect in diamond, bear an exact or nearly exact C 3v symmetry, giving them selection rules which lead their important magnetooptical properties. The embedding diamond-like crystal lattice not only determines the symmetry of two-site defects, but also ensure a nontoxic vehicle on which they reside; a definitive requirement against biomarker nanosystems. In the silicon-vacancy case, the size of the biomarker system is also an important feature. Nanoparticles of the embedding crystal do not exceed the size of molecular clusters, in order to be able to aid measuring all types of relevant biomolecular processes.

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A Quantum Delayed-Choice Experiment

Cited by 256 publications

References 35 publications

Duality of quantum coherence and path distinguishability

Duality of quantum coherence and path distinguishability

An Approach To “Quantumness” In Coherent Control

Two-site diamond-like point defects as new single-photon emitters

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