https://doi.org/10.1140/epjc/s10052-025-15003-1
Regular Article - Theoretical Physics
Impact of parity violation on quantum entanglement and Bell nonlocality
1
State Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 201210, Shanghai, China
2
Key Laboratory for Particle Astrophysics and Cosmology (MOE) and Shanghai Key Laboratory for Particle Physics and Cosmology, Tsung-Dao Lee Institute and School of Physcis and Astronomy, Shanghai Jiao Tong University, 201210, Shanghai, China
3
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
4
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China
5
School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, 310024, Hangzhou, China
6
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, 100190, Beijing, China
7
School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
8
School of Physics and Center for High-Energy Physics, Peking University, 100871, Beijing, China
a
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Received:
5
August
2025
Accepted:
26
October
2025
Published online:
5
November
2025
We present our new findings on how various fundamental interactions decisively shape quantum entanglement and the Bell measure within and beyond the quantum field theory (QFT). In QFT, parity symmetry plays a key role in determining entanglement. Parity-conserving interactions produce maximally entangled bipartite systems, while maximally parity-violating interactions result in disentangled bipartite systems, placing the Bell measure on the boundary between classical and quantum theories. By examining the relation between quantum entanglement and Bell measure, we find that clean signals for interactions beyond QFT may be obtained. We propose methods to test these potential signals. Furthermore, we highlight the previously overlooked influence of magnetic fields within detectors, which radically alters predictions for quantum entanglement and Bell nonlocality. This environmental effect induces spurious P and charge-parity (CP) violations, which has to be carefully accounted for to reveal the true P, CP, and Bell nonlocality effects.
© The Author(s) 2025
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