Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Tunnelling & Josephson Junctions

TT 6.10: Talk

Monday, March 11, 2013, 12:00–12:15, H18

Quantum phase fluctuations in Josephson junction systems — •Gianluca Rastelli — Universität Konstanz

Coherent Quantum Phase-Slip (CQPS) processes in superconducting systems are an active research topic. They have been studied theoretically [1-3] and experimentally, in 1D Josephson junction chains [4] and in superconducting nanowires [5]. CQPSs are of main interest for the realization of qubits topologically protected against decoherence and for the achievement of a fundamental current standard in quantum metrology [1]. I will discuss CQPSs in Josephson junction rings biased with an external magnetic flux and with an arbitrary (long) range for the electrostatic interaction between the N superconducting islands.I will also present a comparison between the theory and the experimental observations reported by the group of Grenoble.
[1] J. E. Mooij and Y. V. Nazarov, Nat. Physics (2006)
K. A. Matveev et al., PRL (2002)
G. Rastelli et al., arXiv:1201.0539
I. M. Pop et al., Nat. Phys. Lett. (2010)
O. V. Astafiev et al., Nat. Lett. (2012)