Quantum detection of CP violation in the $t\bar{t}$ system: production

• URL: http://arxiv.org/abs/2607.25029v1
• Date: Mon, 27 Jul 2026 19:41:29 GMT
• Title: Quantum detection of CP violation in the $t\bar{t}$ system: production
• Abstract summary: We investigate how possible new CP-violating top-quark interactions are encoded in the quantum state of a produced $tbar t$ pair.<n>We construct observables that directly probe CP-odd structures in the Fano--Bloch decomposition.<n>We assess the sensitivity of these observables to possible new sources of CP violation in top-quark production.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate how possible new CP-violating top-quark interactions are encoded in the quantum state of a produced $t\bar t$ pair. We derive analytic expressions for the production density matrix in several benchmark channels relevant to hadron, lepton and photon colliders. In a common spin basis, we identify two characteristic CP-odd structures in the Fano--Bloch decomposition: a difference between the top and antitop polarisation vectors and an antisymmetric component of the spin-correlation matrix. We construct observables that directly probe these structures and study how quantum information measures, including discord, concurrence, magic and trace distance, respond to CP-even and CP-odd SMEFT contributions. Finally, using current measurements and future collider projections, we assess the sensitivity of these observables to possible new sources of CP violation in top-quark production. This establishes the production-level framework whose experimental reconstruction is developed in a companion paper.

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