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The European Physical Journal Plus

About the neutrino oscillation-like effects in general physical systems

Alejandro Cabo Montes de, Nana Cabo Bizet

Published Oct 1, 2021• 2 citations
Publisher
DOI
10.1140/epjp/s13360-021-02011-9

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•Oct 5, 2020•0 citations
We discuss the effect of environmental decoherence on matter-effective neutrino oscillation probabilities. Decoherence is a phenomenon observed in systems interacting with the environment. We treat the neutrinos as an open quantum system and by using the Lindblad Master equation we study the evolution of neutrino states. The matter effect is incorporated for neutrinos passing through matter with the help of the Cayley-Hamilton formalism. In this work, we have developed a general algorithm that attempts to solve the Lindblad Master Equation to compute the neutrino oscillation probabilities in presence of environmental decoherence. We extensively validate the algorithm and explore how environmentally induced decoherence can potentially affect the oscillation probabilities, particularly in the long-baseline sector.
In this paper the authors demonstrate the emulation of neutrino oscillations on a quantum processor, directly encoding three-neutrino flavor evolution onto the two-qubit system of a publicly available quantum computer and time-evolving the system analogously to the physical neutrino. Excellent agreement with with the standard classical calculation is found, and extensions to more complex systems including beyond-standard-model physics involving sterile neutrinos, anomalous decoherence, and matter effects are explored.
Effects of physics beyond the standard model in the neutrino sector are conveniently incorporated through non-standard interaction parameters. Assuming new physics in the form of dimension-6 vector operators, a recent global analysis of neutrino oscillation data including results from COHERENT experiment suggests two favorable new physics scenarios. These are LMA-Light (with normal mass ordering) and LMA-Dark (with inverted mass ordering) sectors of parameters. In this work, we study the effects of these new physics solutions on Leggett-Garg-type (LGtI) inequality which quantifies temporal correlations in the system along with flavor entropy and genuine tripartite entanglement which can be considered as measures of spatial correlations. We show that the violation of LGtI for neutrino energy range between 3-4 GeV in the DUNE experimental set-up can not only be an indication of presence of new physics but such a new physics is expected to be in the form of LMA-Dark sector with inverted ordering. Further, we show that the LMA-Light solution, in general, decreases the values of all measures of quantum correlations in comparison to their SM predictions. On the other hand, the Dark solution can significantly enhance the values of these measures.