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TT: Fachverband Tiefe Temperaturen

TT 6: Transport: Quantum Coherence and Quantum Information Systems - Theory I

TT 6.8: Vortrag

Montag, 31. März 2014, 12:45–13:00, HSZ 204

From Coulomb-Blockade to Nonlinear Quantum Dynamics in a Superconducting Circuit with a Resonator — Vera Gramich, •Björn Kubala, Selina Rohrer, and Joachim Ankerhold — Institut für Theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany

Motivated by recent experiments [1] on superconducting circuits consisting of a dc-voltage-biased Josephson junction in series with a resonator, quantum properties of these devices far from equilibrium are studied [2]. This includes a crossover from a domain of incoherent to a domain of coherent Cooper pair tunneling, where the circuit realizes a driven nonlinear oscillator. Equivalently, weak photon-charge coupling turns into strong correlations captured by a single degree of freedom. Radiated photons offer a new tool to monitor charge flow and current noise gives access to nonlinear dynamics, which allows us to analyze quantum-classical boundaries. Higher order resonances are discussed as well and provide new avenues for future experiments.
[1] M. Hofheinz, F. Portier, Q. Baudouin, P. Joyez, D. Vion, P. Bertet, P. Roche, and D. Esteve, Phys. Rev. Lett. 106, 217005 (2011).
[2] V. Gramich, B. Kubala, S. Rohrer, and J. Ankerhold, accepted for publication in Phys. Rev. Lett., arXiv:1307.2495.