Work

Quantum entanglement and Bell nonlocality in top-quark pair production at a photon linear collider

Year: 2026

Type: article

Abstract: A bstract A photon linear collider, the two-photon collision mode of an e + e − linear collider, uses high-energy laser photons backscattered off the incoming electrons and positrons. The colliding-photon polarization is fully controllable through the polarizations of the initial electron and positron beams and laser photons. We investigate the impact of colliding-photon polarization on the observability of quantum entanglement in top-quark pair production at a photon linear collider. Constructing the spin density matrix of the $$t\overline{t }$$ two-qubit system from the helicity amplitudes, we demonstrate that a photon linear collider is an ideal machine to probe quantum entanglement and Bell nonlocality across the broad phase space of the process.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep10(2026)017

Authors: Seong Youl Choi, Dong Woo Kang, Jae Sik Lee, Chan Beom Park

Institutions: Jeonbuk National University, Chonnam National University

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Research Foundation, Ministry of Science and ICT, South Korea

Awards: G4286615259, G5460203871