Decoherence in a superconducting flux qubit with a pi-junction

Kato, T. and Golubov, A.A. and Nakamura, Y. (2007) Decoherence in a superconducting flux qubit with a pi-junction. Physical Review B: Condensed matter and materials physics, 76 (17). p. 172502. ISSN 1098-0121

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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.
Item Type:	Article
Copyright:	© 2007 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/58278
Official URL:	http://dx.doi.org/10.1103/PhysRevB.76.172502
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