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

open access
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
Science and Technology (TNW)
Research Group:
Link to this item:
Official URL:
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 242858