Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Transport: Quantum Coherence and Quantum Information
TT 44.9: Vortrag
Donnerstag, 26. März 2009, 16:15–16:30, HSZ 304
Relaxation of Josephson qubits due to strong coupling to two-level systems — •Clemens Müller and Alexander Shnirman — Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany
Naturally formed two-level systems (TLS) present in the oxide layer of nm-sized Josephson junctions pose a strong complication in the design of superconducting qubits. Recently an experiment used the coherent dynamics of a strongly coupled TLS to demonstrate its uses as a naturally formed quantum memory [1]. We calculate the effect of strongly coupled TLS on the relaxation rate Γ1 of the qubit. In addition to providing results for single TLS we analyse the effects of an ensemble of TLS.
[1] M. Neeley at al, Nature Physics 4, 523 (2008)