Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Quantum Coherence, Quantum Information Systems 2
TT 42.4: Vortrag
Mittwoch, 13. März 2013, 15:45–16:00, H18
Tunable gradiometric flux qubits in circuit-QED experiments — •J. Goetz1, M. J. Schwarz1, Z. Jiang1,2, F. Sterr1,2, M. Häberlein1, F. Deppe1,2, A. Marx1, and R. Gross1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching — 2Physik Department, TU München, Garching
Gradiometric flux qubits with tunable minimal transition frequency have strong potential for scalable quantum circuits as well as for the realisation of various coupling schemes between qubits and coplanar waveguide resonators. We have systematically studied the tuning of the minimal transition frequency, the so called qubit gap, of single qubits depending on fabrication parameters [1]. In addition we investigate how the special geometry of these qubits allows us to switch between the ultrastrong-coupling regime and negligible coupling strength. We discuss the application of tunable gradiometric flux qubits in establishing strong σx coupling between a resonator mode and the qubit enabling the simulation of relativistic quantum systems.
This work is supported by the DFG via SFB 631, the Excellence Initiative via NIM, as well as by the EU-projects CCQED and PROMISCE.
[1] M. J. Schwarz et al., arXiv:1210.3982