%0 Journal Article
%A Viola, Giovanni
%A Catelani, Gianluigi
%T Collective modes in the fluxonium qubit
%J Physical review / B
%V 92
%N 22
%@ 1098-0121
%C College Park, Md.
%I APS
%M FZJ-2015-07865
%P 224511
%D 2015
%X Superconducting qubit designs vary in complexity from single- and few-junction systems, such as the transmon and flux qubits, to the many-junction fluxonium. Here, we consider the question of whether the many degrees of freedom in the fluxonium circuit can limit the qubit coherence time. Such a limitation is in principle possible, due to the interactions between the low-energy, highly anharmonic qubit mode and the higher-energy, weakly anharmonic collective modes. We show that so long as the coupling of the collective modes with the external electromagnetic environment is sufficiently weaker than the qubit-environment coupling, the qubit dephasing induced by the collective modes does not significantly contribute to decoherence. Therefore, the increased complexity of the fluxonium qubit does not constitute by itself a major obstacle for its use in quantum computation architectures.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000367060600005
%R 10.1103/PhysRevB.92.224511
%U https://juser.fz-juelich.de/record/280119