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Collective modes in the fluxonium qubit

Giovanni Viola (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Gianluigi Catelani
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 92 (2015), 22,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: qubit; fluxonium; dephasing;

Denna post skapades 2015-08-08. Senast ändrad 2016-10-11.
CPL Pubid: 220366


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