Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: TR: Quantum Coherence and Quantum Information Systems 1
TT 18.6: Vortrag
Dienstag, 23. März 2010, 15:30–15:45, H21
Two-resonator circuit QED: Dissipative Theory — •Georg M. Reuther1, David Zueco1, Frank Deppe2, Elisabeth Hoffmann2, Edwin P. Menzel2, Thomas Weißl2, Matteo Mariantoni2, Sigmund Kohler3, Achim Marx2, Enrique Solano4, Rudolf Gross2, and Peter Hänggi1 — 1Institut für Physik, Uni Augsburg, D-86135 Augsburg — 2Walther-Meißner-Institut, Bayer. Akademie der Wissenschaften, D-85748 Garching — 3Instituto de Ciencia de Materiales de Madrid, CSIC, E-29049 Madrid — 4Departamento de Quimica Fisica, Univ. del Pais Vasco, E-48080 Bilbao
Managing the interaction between two quantum objects is a fundamental issue for quantum information processing. A promising approach is a two-resonator circuit quantum electrodynamics setup referred to as quantum switch [1]. Here, a superconducting qubit provides switchable coupling between the resonators. This requires operation in the dispersive regime, where the qubit transition frequency is far detuned from those of the resonators. In our contribution we present a dissipative theory for the quantum switch [2]. We derive an effective Hamiltonian beyond rotating-wave approximation and study the dissipative dynamics within a quantum master equation approach. We derive analytically how the qubit affects the dynamics and the coherence of the switch even if its state remains constant, and we estimate the strength of this influence. Our results are corroborated by numerical simulations. We acknowledge support from SFB631 and NIM.
[1] M. Mariantoni et al., Phys. Rev. B 78, 104508 (2008)
[2] G. M. Reuther et al., arXiv:0911.2657