This method constructs flavor density matrices in neutral meson systems, suggesting new insights into quantum correlations.
The flavor space of particles produced in collider environments contains informative quantum correlations. We present a systematic approach for constructing the complete flavor density matrix for a meson and antimeson system (M M) in the Bloch vector space at a given time t, which can be at or after production. We point out that the Bₛ⁰ and K⁰ systems are superior to the B⁰d and D⁰ systems for quantum tomography because of their flavor oscillation and decay properties. Performing quantum tomography for the M M system can facilitate the study of production mechanisms, decoherence phenomena, quantum information variables, and potential new sources of CP violation.
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Cheng et al. (2025) studied this question.
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