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Q: Fachverband Quantenoptik und Photonik
Q 39: Photon BEC
Q 39.2: Vortrag
Mittwoch, 12. März 2025, 14:45–15:00, HS V
Dissipative dynamics and entanglement signatures of photon Bose-Einstein condensates in multiple microcavities — •Aya Abouelela1 and Johann Kroha1,2 — 1Univeristy of Bonn, Germany — 2University of St. Andrews, UK
Quantum gases of photons have proven to be a versatile platform for investigating various quantum effects in many-body systems, including Bose-Einstein condensation, quantum coherence and entanglement. In this work, we investigate the driven-dissipative dynamics of open photon Bose-Einstein condensates (BEC) in a single-mode microcavity filled with dye molecules using the Lindblad master-equation approach. Two distinct types of dynamics are observed, a quasi-stationary condensate, which loses coherence after a sufficiently long time, and a lasing regime with finite condensate density in the steady state. We compute a phase diagram, which includes both the BEC and lasing regimes as a function of the experimentally tunable parameters, i.e., the external pumping power and the photon detuning frequency. We explore the possible entanglement signatures in a system of two coupled microcavities. The cavities are coupled via direct photon, as well as, molecule-assisted tunneling and the system can be proven to describe two-mode Gaussian states. We use the von Neumann entropy to quantify the degree of mutual information between the two states. Lastly, we utilize the covariance matrix to study the violation of the Peres-Horodecki criterion which implies inseparability of states, and consequently, entanglement.
Keywords: Non-equilibrium physics; Lindblad master equation; Photon Bose-Einstein condensate; Quantum entanglement; Optical microcavities