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This research investigates quantum correlations in axion-like particle decays within intense electromagnetic fields, revealing how finite mass enables pair creation below standard thresholds. By utilizing quasiclassical operator formalism, the study identifies specific entanglement signatures that could distinguish strong-field production mechanisms from vacuum decay processes. These findings provide novel theoretical benchmarks for detecting dark matter candidates through spin-dependent oscillatory modulations in future high-intensity laser experiments.

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Spin-Resolved ALP Decay Shows Concurrence of 0.33 Near Threshold

Quantum ZeitgeistAugust 4, 20266 min read

Spin-Resolved Decay of Axion-Like Particles into Electron–Positron Pairs in Strong Electromagnetic Fields AUTHORS AND AFFILIATIONS: Xiaodan Mao State Key Laboratory of Dark Matter Physics, Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China Yue-Yue Chen Department of Physics, Shanghai Normal University, Shanghai 200234, China Pei-Lun He State Key Laboratory of Dark Matter Physics, Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China License: arXiv.org perpetual non-exclusive license [hep-ph] 16 Jul 2026 Spin-Resolved Decay of Axion-Like Particles into Electron–Positron Pairs in Strong Electromagnetic Fields We investigate spin-resolved decay of an axion-like particle (ALP) into an electron–positron pair in an intense laser field.

Researchers have calculated a concurrence of when strong-field production dominates but becoming separable when vacuum decay dominates. in the spin-resolved decay of axion-like particles into electron-positron pairs, revealing a quantifiable level of quantum correlation. The work, led by Xiaodan Mao and Pei-Lun He of Shanghai Jiao Tong University and Yue-Yue Chen of Shanghai Normal University, demonstrates that a finite ALP mass enables particle creation even below the normally expected vacuum threshold. This surprising result reorganizes the expected spectrum, generating spin-dependent oscillatory modulations above the vacuum threshold through the coherent interplay of vacuum and field-assisted contributions. These results identify spin-resolved spectra and entanglement as potential signatures…

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