TY  - JOUR
AU  - Viola, Giovanni
AU  - Catelani, Gianluigi
TI  - Collective modes in the fluxonium qubit
JO  - Physical review / B
VL  - 92
IS  - 22
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-07865
SP  - 224511
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000367060600005
DO  - DOI:10.1103/PhysRevB.92.224511
UR  - https://juser.fz-juelich.de/record/280119
ER  -