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  • Open Access

Quantum Tomography in Neutral Meson and Antimeson Systems

Kun Cheng*, Tao Han†, Matthew Low‡, and Tong Arthur Wu§

  • PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, 3941 O’Hara Street, Pittsburgh, Pennsylvania 15260, USA

  • *Contact author: kun.cheng@pitt.edu
  • †Contact author: than@pitt.edu
  • ‡Contact author: mal431@pitt.edu
  • §Contact author: tow39@pitt.edu
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Phys. Rev. Lett. 136, 181803 – Published 5 May, 2026

DOI: https://doi.org/10.1103/t9vg-hk6c

Abstract

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 (MM¯) 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 Bd0 and D0 systems for quantum tomography because of their flavor oscillation and decay properties. Performing quantum tomography for the MM¯ system can facilitate the study of production mechanisms, decoherence phenomena, quantum information variables, and potential new sources of CP violation.

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Phys. Rev. Lett. 136, 181803– Published 5 May, 2026
  • Received 1 August 2025
  • Revised 16 March 2026
  • Accepted 25 March 2026
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