Classical Physics and the Bounds of Quantum Correlations

Frustaglia, Diego; Baltanás, J. P.; Velázquez-Ahumada, María C.; Fernández‐Prieto, Armando; Lujambio, A.; Losada, V.; Freire, Manuel J.; Cabello, Adán

doi:10.1103/physrevlett.116.250404

Cited by 37 publications

(47 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2) in the main text. (19) 0.0058 (7) 0.5554 (19) 0.0020(4) −3.0074 (9) In our experiment, the main imperfection is the inaccuracies of the configurations of waveplates and beam displacers. This imperfection may lead to five observables which are not ideally symmetric as the maximum violation case.…”

Section: Kcbs Valuementioning

confidence: 69%

“…In particular, there have been debates on whether classical fields, i.e. coherent or stochastic light beams, can reproduce the correlations to violate NC inequalities [19,20] or not [21], and whether such correlations may enhance the performance of certain applications [22][23][24].…”

mentioning

confidence: 99%

“…To date, tests of contextuality and entanglement in classical systems have used measurement devices different from those used for quantum systems [17][18][19], and the binary outcomes are not the direct response of the devices but rather defined artificially with certain selection rules and through proper considerations of measure-ment events [19]. Although these devices are elaborately designed to ensure the classical systems reproduce probability distributions given by the quantum theory, they have, nevertheless, different working mechanisms other than those used for quantum systems.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Experimental Test of Contextuality in Quantum and Classical Systems

Zhang

Xie

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

Contextuality is considered as an intrinsic signature of non-classicality, and a crucial resource for achieving unique advantages of quantum information processing. However, recently there have been debates on whether classical fields may also demonstrate contextuality. Here we experimentally configure a contextuality test for optical fields, adopting various definitions of measurement events, and analyse how the definitions affect the emergence of non-classical correlations. The heralded single photon state, a typical non-classical light field, manifests contextuality in our setup, while contextuality for classical coherent fields strongly depends on the specific definition of measurement events which is equivalent to filtering the non-classical component of the input state. Our results highlight the importance of definition of measurement events to demonstrate contextuality, and link the contextual correlations to non-classicality defined by quasi-probabilities in phase space. arXiv:1810.07966v2 [quant-ph]

show abstract

Section: Kcbs Valuementioning

confidence: 69%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Experimental Test of Contextuality in Quantum and Classical Systems

Zhang

Xie

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…On the other hand, recent investigation has shown that the quantum bound is not exclusive to quantum theory33. It has been demonstrated that the quantum bound exists similarly in classical microwaves.…”

mentioning

confidence: 99%

Experimental contextuality in classical light

Zeng

Song

et al. 2017

Sci Rep

View full text Add to dashboard Cite

The Klyachko, Can, Binicioglu, and Shumovsky (KCBS) inequality is an important contextuality inequality in three-level system, which has been demonstrated experimentally by using quantum states. Using the path and polarization degrees of freedom of classical optics fields, we have constructed the classical trit (cetrit), tested the KCBS inequality and its geometrical form (Wright’s inequality) in this work. The projection measurement has been implemented, the clear violations of the KCBS inequality and its geometrical form have been observed. This means that the contextuality inequality, which is commonly used in test of the conflict between quantum theory and noncontextual realism, may be used as a quantitative tool in classical optical coherence to describe correlation characteristics of the classical fields.

show abstract

“…[19] and Spreeuw [10], which allows to reconstruct probability distributions coming from any quantum correlations tests using classical optical circuits. As an illustration of their method, the authors of [18] performed an experiment with microwave circuits showing violations of the CHSH [9] and Mermin [20] type inequalities.…”

mentioning

confidence: 99%

From contextuality of a single photon to realism of an electromagnetic wave

Markiewicz

Kaszlikowski

Kurzyński

et al. 2019

Rochester Conference on Coherence and Quantum Optics (CQO-11)

View full text Add to dashboard Cite

Violations of Bell inequalities have been an incontestable indicator of non-classicality since the seminal paper by John Bell. However, recent claims of Bell inequalities violations with classical light have cast some doubts on their significance as hallmarks of non-classicality. Here, we challenge those claims. The crux of the problem is that such classical experiments simulate quantum probabilities with intensities of classical fields. However, fields intensities measurements are radically different from single-photon detections, which are primitives of any genuine Bell experiment. We show that this fundamental difference between field intensities measurements and single photon detections shifts the classical bound of relevant Bell inequalities to its algebraic limit, leaving no place for their violations.The quantum-to-classical transition in optical interferometry can be observed either in a single-particle or multi-particle interference [1]. The multi-particle interference is commonly regarded as more fundamental, including purely quantum phenomena such as the Hong-Ou-Mandel (HOM) effect [2] and multi-photon violations of Bell inequalities [3]. The quantum-to-classical transition in these phenomena has different origins. In the HOM setting it can be attributed to the strength of particle indistinguishability [4] whereas multi-photon Bell inequality violations are tied to the coherence strength between entangled photons or, in the limit of many particles, to the vanishing ability of revealing single particle properties with multi-photon measurements [5].

show abstract

Classical Physics and the Bounds of Quantum Correlations

Cited by 37 publications

References 37 publications

Experimental Test of Contextuality in Quantum and Classical Systems

Experimental Test of Contextuality in Quantum and Classical Systems

Experimental contextuality in classical light

From contextuality of a single photon to realism of an electromagnetic wave

Contact Info

Product

Resources

About