Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Atomic Systems in External Fields I
A 11.6: Vortrag
Dienstag, 3. März 2026, 12:30–12:45, N 2
On classically mediated quantum entanglement — •Sebastian Ulbricht1,2, Andrés Darío Bermúdez Manjarres3, and Marcel Reginatto2 — 1Institut für Mathematische Physik, Technische Universität Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt PTB, Bundesallee 100, 38116 Braunschweig, Germany — 3Universidad Distrital Francisco José de Caldas, Cra. 7 No. 40B-53, Bogotá, Colombia
The question of whether quantum states can become entangled when they interact via a classical mediator is still a matter of ongoing discussion. This lively debate is deeply interwoven with the question of whether entanglement studies can prove the quantum - or classical - nature of gravity. In recent years, there have been numerous statements and no-go theorems, supporting one or the other position. However, while appearing to be universal, no-go theorems `forbidding' classically mediated quantum entanglement do depend on the used quantum-classical hybrid theory. In this talk, we show that in Hybrid van Hove theory [1] two initially uncorrelated spins can become entangled even if they are only coupled via a classical harmonic oscillator. We further demonstrate that the spin-spin correlations and the entanglement of the spins closely resemble the fully quantum case. Our investigation shows that existing no-go theorems are not universal. It further implies that consistent quantum theories featuring classical gravity cannot be categorically ruled out by quantum entanglement studies. [1] M. Reginatto, A.D. Bermúdez Manjarres, and S. Ulbricht, J. Phys.: Conf. Ser. 3017 012037 (2025)
Keywords: Hybrid classical-quantum systems; Hilbert space; Hamiltonian quantum mechanics; Theoretical physics; Quantum gravity