CP asymmetry and visible decay in 3+1 neutrino oscillations on a quantum computer
Abstract
We use quantum simulation to study how visible neutrino decay modifies the vacuum CP asymmetry in muon-to-electron oscillations within a 3+1 neutrino scenario. The decay channel preserves CP symmetry, with CP violation arising from phases in the mixing matrix. We track the energy redistribution from visible decay and distinguish how parent attenuation and daughter regeneration modify the CP asymmetry. For the reference benchmark, the regenerated contribution is 4.85×10−4, approximately 46% of the total decay-induced shift. The full circuit for an effective two-energy model agrees with independent classical evolution. On an IBM quantum processor, we prepare the daughter state conditioned on decay and restore its physical normalization using fixed source and decay probabilities. After correction for measurement errors, the flavor-probability and coherence measurements both agree with the prediction within one standard error. Null controls test the suppression of the regenerated signal when daughter coherence or the relevant CP-sensitive mixing factor vanishes.
Related
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BibTeX
@misc{sengupta2026asymmetry,
title = {{CP asymmetry and visible decay in $3+1$ neutrino oscillations on a quantum computer}},
author = {Amartya Sengupta and Sidhartha Samtani and Ani Girgvliani and Dejan Stojkovic},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.27670},
eprint = {2609.27670},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.27670},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - CP asymmetry and visible decay in 3+1 neutrino oscillations on a quantum computer
AU - Amartya Sengupta
AU - Sidhartha Samtani
AU - Ani Girgvliani
AU - Dejan Stojkovic
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2609.27670
UR - https://arxiv.org/abs/2609.27670
AB - We use quantum simulation to study how visible neutrino decay modifies the vacuum CP asymmetry in muon-to-electron oscillations within a 3+1 neutrino scenario. The decay channel preserves CP symmetry, with CP violation arising from phases in the mixing matrix. We track the energy redistribution from visible decay and distinguish how parent attenuation and daughter regeneration modify the CP asymmetry. For the reference benchmark, the regenerated contribution is 4.85×10^−4, approximately 46% of the total decay-induced shift. The full circuit for an effective two-energy model agrees with independent classical evolution. On an IBM quantum processor, we prepare the daughter state conditioned on decay and restore its physical normalization using fixed source and decay probabilities. After correction for measurement errors, the flavor-probability and coherence measurements both agree with the prediction within one standard error. Null controls test the suppression of the regenerated signal when daughter coherence or the relevant CP-sensitive mixing factor vanishes.
ER -