Work

High energy photon polarimetry at lepton colliders: Quantum information from converted photons

Year: 2026

Type: article

Abstract: We study high-energy photons produced at a lepton collider that convert into an $e^+e^-$ pair in the detector, as a tool for measuring quantum information observables. We consider single- and double-conversion processes in $e^+e^- \to γγ$ and $e^+e^- \to e^+e^-γ$. Single conversions enable an in situ extraction of the spin-analyzing power, while double conversions probe polarization correlations. Focusing on the Belle-II detector, we show that, depending on the reconstruction resolution of the opening angle of the conversion $e^+e^-$ pair, quantum correlations of the diphoton system can be probed. In particular, measurements of violations of the Bell inequality, quantum discord, concurrence, nonstabilizerness, and steerability with spatially separated GeV-scale photons can be made at high significance.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/nn51-zg5k

Authors: Carlos Henrique de Lima, Navin McGinnis, David McKeen

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, U.S. Department of Energy, Aspen Center for Physics, TRIUMF, Natural Sciences and Engineering Research Council of Canada

Awards: G2595738051, G638484911, Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics, UNIVERSITY OF ARIZONA HIGH ENERGY PHYSICS PROGRAM

OpenAlex ID: W7168173842

FWCI: 6.067

Cites: 109

Cited by: 5

Related to: 10