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TT: Fachverband Tiefe Temperaturen

TT 7: Transport: Quantum Coherence and Quantum Information Systems – Theory (jointly with HL, MA)

TT 7.1: Vortrag

Montag, 16. März 2015, 09:30–09:45, H 3005

Collective modes in the fluxonium qubit — •Gianluigi Catelani¹ and Giovanni Viola² — ¹Forschungszentrum Jülich, PGI-2 — ²RWTH Aachen, IQI

In the fluxonium qubit, an array comprising a large number of identical Josephson junctions form a so-called superinductance. The superinductance is connected to a junction -- the phase slip element -- with a smaller Josephson energy and a different charging energy. We investigate the effects of unavoidable capacitive couplings to ground as well as non-linearities of the superinductance: they both introduce interactions between the low-energy qubit degree of freedom and higher-energy collective modes of the circuit. We also consider the role of the additional capacitances that are used to couple the qubit to a resonator for driving and read-out. We show that the interactions with the collective modes can affect not only the spectrum of the qubit but also its coherence.

Work supported in part by the EU under REA grant agreement CIG-618258