Quantum Bell-triplet states emerge from 151 MeV proton collisions

Researchers from Fudan University in Shanghai, China and the Universidade de Santiago de Compostela in Spain have demonstrated the emergence of a near-pure Bell-triplet state from 151 MeV proton collisions at a 90-degree scattering angle. This work establishes proton-proton scattering as a potential source of high-fidelity entanglement, a key resource for quantum information science typically associated with more controlled systems. Building on this finding, the team proposes a quantum teleportation protocol for proton spins, using the strong interaction’s Hamiltonian for Bell measurement. These results bridge few-body nuclear physics and quantum technology, positioning proton-proton scattering as both an entanglement source and a natural quantum processor. Proton-proton scattering energy of 151 MeV generates a near-pure Bell-triplet state when observed at a scattering angle of 90 degrees, a finding that establishes a new regime for observing quantum entanglement. This observation deviates from typical entanglement experiments requiring highly controlled systems, instead demonstrating the emergence of this quantum property from relatively high-energy particle collisions. The scattering amplitude itself functions as a transition operator, effectively connecting different Bell states within this specific kinematic regime. Quantifying the entanglement properties of these collisions relies on metrics like entanglement power and concurrence, tools…