Demonstration of Quantum Nonlocality in presence of Measurement Dependence - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2015

Demonstration of Quantum Nonlocality in presence of Measurement Dependence

Résumé

Quantum nonlocality stands as a resource for Device Independent Quantum Information Processing (DIQIP), as, for instance, Device Independent Quantum Key Distribution. We investigate experimentally the assumption of limited Measurement Dependence, i.e., that the measurement settings used in Bell inequality tests or DIQIP are partially influenced by the source of entangled particle and/or by an adversary. Using a recently derived Bell-like inequality [Phys. Rev. Lett. 113 190402 ] and a 99% fidelity source of partially entangled polarization photonic qubits, we obtain a clear violation of the inequality, excluding a much larger range of measurement dependent local models than would be possible with an adapted Clauser, Horne, Shimony and Holt (CHSH) inequality. It is therefore shown that the Measurement Independence assumption can be widely relaxed while still demonstrating quantum nonlocality. Introduction– The violation of a Bell inequality demonstrates that the observed correlations cannot be explained by any theoretical model based only on local variables that propagate gradually and continuously through space. This seminal result by John S. Bell [1] is nowadays considered fundamental for our understanding of quantum physics. Indeed, today the best way to demonstrate that one masters some quantum degree of freedom of some physical system is to violate a Bell inequality using this degree of freedom. Additionally, quantum nonlocality, i.e., the violation of a Bell inequality, is the resource physicists and computers scientists exploit in Device Independent Quantum Information Processing (DIQIP), like Device Independent Quantum Key Distribution [2, 3] and Device Independent Quantum Random Number Generators [4]. This dual fundamental-&-applied importance of quantum nonlocality has triggered an interesting scientific race to close both the locality and the detection loopholes simultaneously in one single experiment [5–9]. However, there is another sort of assumption in the derivation of Bell inequalities, that of Measurement Independence (also known as " Freedom of Choice " , " Free Randomness " , or sometimes loosely denoted by " Free Will "). This assumption states that the hypothetical local variable, traditionally referred to as λ, does not influence the local choices of measurement settings performed by the two parties Alice and Bob. Formally, denoting by x and y the measurement settings of Alice and Bob, respectively , this assumption reads [10, 11]: P (xy|λ) = P (xy) ∀x, y, λ. (1)
Fichier principal
Vignette du fichier
Aktas_MDL_arXiv.pdf (489.16 Ko) Télécharger le fichier
Fig1.pdf (54.85 Ko) Télécharger le fichier
Fig2.pdf (71.64 Ko) Télécharger le fichier
Fig3a.pdf (44.26 Ko) Télécharger le fichier
Fig3b.pdf (43.72 Ko) Télécharger le fichier
Fig3c.pdf (45.56 Ko) Télécharger le fichier
Fig3d.pdf (45.09 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01161453 , version 1 (08-06-2015)

Identifiants

Citer

Djeylan Aktas, Sébastien Tanzilli, Anthony Martin, Gilles Pütz, Rob Thew, et al.. Demonstration of Quantum Nonlocality in presence of Measurement Dependence. Physical Review Letters, 2015, 114, pp.220404. ⟨10.1103/PhysRevLett.114.220404⟩. ⟨hal-01161453⟩
287 Consultations
425 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More