Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 14: Quantum Foundations

QI 14.5: Vortrag

Freitag, 9. September 2022, 10:45–11:00, H9

Gravitational redshift induces quantum interference — •David Edward Bruschi¹ and Andreas Wolfgang Schell^2,3 — ¹Institute for Quantum Computing Analytics (PGI-12), Forschungszentrum Jülich, Jülich, Germany — ²Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover, Germany — ³Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

We use quantum field theory in curved spacetime to show that gravitational redshift induces a unitary transformation on the quantum state of propagating photons. This occurs for realistic photons characterized by a finite bandwidth, while ideal photons with sharp frequencies do not transform unitarily. We find that the transformation is a mode-mixing operation, and we devise a protocol that exploits gravity to induce a Hong-Ou-Mandel-like interference effect on the state of two photons. Testing the results of this work can provide a demonstration of quantum field theory in curved spacetime.