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Q: Fachverband Quantenoptik und Photonik
Q 11: QED and Cavity QED
Q 11.6: Talk
Monday, March 10, 2025, 18:15–18:30, HS Botanik
Quantum radiation and its correlations in tuneable dielectrics — •Sascha Lang1,2,3, Stefan Yoshi Buhmann1, Ralf Schützhold2,4,3, and William G. Unruh5 — 1University of Kassel, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Germany — 3Universität Duisburg-Essen, Germany — 4Technische Universität Dresden, Germany — 5University of British Columbia, Canada
Recent advances in THz nonlinear optics have revealed characteristic imprints of quantum vacuum fluctuations onto the two-point correlations of the electric field [1]. Media with explicitly time dependent properties even allow quantum vacuum fluctuations to be spontaneously promoted to real photon pairs—with distinctive signatures on the field correlations. Existing studies of such quantum radiation phenomena in dielectrics typically neglect dissipation and the associated quantum noise close to material resonances.
Based on established results for non-dispersive and lossless media [2], we are going to discuss the potential of correlation measurements for future quantum radiation experiments. Afterwards, we will present a model which includes dispersion and dissipation but still applies to tuneable media. Our formalism builds upon the famous Hopfield model and describes the medium via harmonic oscillators and a scalar environment field that may carry away energy and information [3].
[1] Settembrini, Lindel, Herter, Buhmann & Faist, Nat. Comm. 13, 3383 (2022)
[2] Lang & Schützhold, Phys. Rev. D 100, 065003 (2019)
[3] Lang, Schützhold & Unruh, Phys. Rev. D 102, 125020 (2022)
Keywords: quantum radiation; dielectrics; microscopic model; Hopfield dielectric; field correlations