Decoherence in a superconducting flux qubit with a pi-junction

T. Kato; T. Kato; Alexandre Avraamovitch Golubov; Y. Nakamura

doi:10.1103/PhysRevB.76.172502

Decoherence in a superconducting flux qubit with a pi-junction

T. Kato, T. Kato, Alexandre Avraamovitch Golubov, Y. Nakamura

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic › peer-review

31 Citations (Scopus)

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Abstract

We consider the use of a pi junction for flux qubits to realize degenerate quantum levels without external magnetic field. On the basis of the Caldeira-Leggett model, we derive an effective spin-Boson model and study decoherence of this type of qubits. We estimate the dephasing time by using parameters from recent experiments of superconductor-insulator-ferromagnet-superconductor junctions and show that high critical current and large subgap resistance are required for the pi junction to realize a long coherent time.

Original language	Undefined
Pages (from-to)	172502-
Journal	Physical review B: Condensed matter and materials physics
Volume	76
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.76.172502
Publication status	Published - 2007

Keywords

METIS-242858
IR-58278

Access to Document

10.1103/PhysRevB.76.172502

decoherence

Cite this

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KW - IR-58278

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DO - 10.1103/PhysRevB.76.172502

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