Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Focus Session: New Bright Sources of Quantum Microwaves
TT 10.6: Talk
Monday, April 1, 2019, 17:45–18:00, H2
Nonlinear quantum dynamics and hidden cats states in a cavity conductor hybrid — •Andrew Armour1, Bjoern Kubala2, and Joachim Ankerhold2 — 1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK — 2Institute for Complex Quantum Systems and IQST, Ulm University, Albert Einstein-Allee 11, 89069 Ulm, Germany
Coupling a mesoscopic conductor to a microwave cavity can lead to fascinating feedback effects which generate strong correlations between the dynamics of photons and charges. We explore the connection between cavity dynamics and charge transport in a model system consisting of a voltage-biased Josephson junction embedded in a high-Q cavity. We find that strong nonlinearities which occur in the cavity dynamics are associated with the emergence of novel regimes of charge and photonic transport. We also show that when the state of the cavity is conditioned on measurements of the number of photons emitted one can reveal fragile features, such as cat states, which are lost within the usual unconditioned dynamics.