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Journal of Physics Conference Series

Realism-based nonlocality in neutrino oscillations

Massimo Blasone A, Silvio De Siena, Cristina Matrella

Published Nov 1, 2024• 1 citation
Publisher

Abstract

Abstract We resort to the concepts of realism and indefiniteness introduced in Ref. [40], and based on the exploitation of ideal quantum tomography procedures. These concepts are connected to the existence of nonlocal correlations, and moreover allow to introduce a measure of nonlocality. In this paper we apply and test the approach of Ref. [40] in the physically relevant phenomenon of two-flavor neutrino oscillations, both in the plane-wave approximation and in the wave-packet approach, finding meaningful confirmations of the validity of the methodology, which allows to discriminate among distinct characters of different observables, and consequently on their physical relevance.

DOI
10.1088/1742-6596/2883/1/012001

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Abstract We resort to the concepts of realism and indefiniteness introduced in Ref. [40], and based on the exploitation of ideal quantum tomography procedures. These concepts are connected to the existence of nonlocal correlations, and moreover allow to introduce a measure of nonlocality. In this paper we apply and test the approach of Ref. [40] in the physically relevant phenomenon of two-flavor neutrino oscillations, both in the plane-wave approximation and in the wave-packet approach, finding meaningful confirmations of the validity of the methodology, which allows to discriminate among distinct characters of different observables, and consequently on their physical relevance.
Abstract Quantum correlations provide a fertile testing ground for investigating fundamental aspects of quantum physics in various systems, especially in the case of relativistic (elementary) particle systems as neutrinos. In a recent paper, Ming et al. (Eur Phys J C 80:275, 2020), in connection with results of Daya-Bay and MINOS experiments, have studied the quantumness in neutrino oscillations in the framework of plane-wave approximation. We extend their treatment by adopting the wave packet approach that accounts for effects due to localization and decoherence. This leads to a better agreement with experimental results, in particular for the case of MINOS experiment.
Abstract Neutrino oscillation is an important physical phenomenon in elementary particle physics, and its nonclassical features can be revealed by the Leggett–Garg inequality. It shows that its quantum coherence can be sustained over astrophysical length scales. In this work, we investigate the measure of quantumness in experimentally observed neutrino oscillations via the nonlocal advantage of quantum coherence (NAQC), quantum steering, and Bell nonlocality. From various neutrino sources, ensembles of reactor and accelerator neutrinos are analyzed at distinct energies, such as Daya Bay (0.5 km and 1.6 km) and MINOS (735 km) collaborations. The NAQC of two-flavor neutrino oscillation is characterized experimentally compared to the theoretical prediction. It exhibits non-monotonously evolutive phenomenon with the increase of energy. Furthermore, it is found that the NAQC is a stronger quantum correlation than quantum steering and Bell nonlocality even in the order of km. Hence, for an arbitrary bipartite neutrino-flavor state with achieving a NAQC, it must be also a steerable and Bell nonlocal state. The results might offer an insight into the neutrino oscillation for the further applications on quantum information processing.
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Abstract In this paper, we consider the quantum correlations, coherence and entanglement, in neutrino oscillation. We find that the l 1 -norm as a coherence measure is equal to the sum of the three possible concurrences for measuring the entanglement among different flavor modes which were calculated in the paper by Blasone M. et al ., EPL , 112 (2015) 20007. Our result shows that the origin of the flavor entanglement in neutrino oscillation is the same as that of quantum coherence. Furthermore, in the wave packet framework, the variation of the l 1 -norm is investigated by varying the wave packet width . As expected, the amount of coherence increases by due to the increase in overlapping of the mass eigenstates.
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