Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Transport: Quantum Coherence and Quantum Information
TT 44.13: Vortrag
Donnerstag, 26. März 2009, 17:30–17:45, HSZ 304
Two-Resonator Circuit QED: A Superconducting Quantum Switch — •Elisabeth Hoffmann1,2, Matteo Mariantoni1, Frank Deppe1,2, Edwin P. Menzel1, Achim Marx1, Rudolf Gross1,2, Frank K. Wilhelm3, and Enrique Solano4 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Straße 8, 85748 Garching — 2Physics Department, TU München, 85748 Garching — 3University Waterloo, Canada — 4Universidad del País Vasco-Eurskal Herriko Unibertsitatea, Spain
Coupling different kind of superconducting (sc) qubits to on-chip microwave resonators has strongly advanced the field of circuit QED. Regarding the application of circuit QED systems in quantum information processing it would be highly desirable to switch on and off the interaction between two resonators. We introduce a formalism for two-resonator circuit QED where two on-chip microwave resonators are simultaneously coupled to one sc qubit. In this three-circuit network, the qubit mediates a geometric and a dynamic second-order interaction between the two resonators [1]. These two coupling strengths can be tuned to be equal by varying the qubit operation point, thus permitting to switch on and off the interaction between the resonators. We discuss the effect of the qubit on the dynamic second-order coupling and how it can be deliberately manipulated to realize a sc quantum switch. Finally, we present a realistic design for implementing a two-resonator circuit QED setup based on a flux qubit and show preliminary experimental results. This work is supported by SFB 631 and NIM.
[1] M. Mariantoni et al., Phys. Rev. B 78, 104508 (2008)