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Q: Fachverband Quantenoptik und Photonik
Q 58: Quantum gases (Bosons) V
Q 58.1: Gruppenbericht
Freitag, 13. März 2020, 11:00–11:30, e214
Thermally condensing photons into a coherently split state of light — •Christian Kurtscheid1, David Dung1, Erik Busley1, Frank Vewinger1, Achim Rosch2, and Martin Weitz1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany — 2Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Cologne, Germany
Techniques to control the quantum state of light play a crucial role in a wide range of fields, from quantum information science to precision measurements. While for electrons in solid state materials complex quantum states can be created by mere cooling, in the field of optics manipulation and control currently builds on non-thermodynamic methods. Using an optical dye microcavity, we have split photon wavepackets by thermalization within a potential with two minima subject to tunnel coupling [1]. Even at room temperature, photons condense into a quantum-coherent bifurcated ground state. Fringe signals upon recombination show the relative coherence between the two wells, demonstrating a working interferometer with the non-unitary thermodynamic beamsplitter. This energetically driven optical state preparation opens up an avenue for exploring novel correlated and entangled optical manybody states.
[1] C. Kurtscheid, D. Dung, E. Busley, F. Vewinger, A. Rosch, M. Weitz, Science 366, 894 (2019).