Decoherence in a superconducting flux qubit with a π-junction
T. Kato, A. A. Golubov, Y. Nakamura
DOI 10.1103/PhysRevB.76.172502 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We consider the use of a π 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 π junction to realize a long coherent time.
Similar papers
Realizable spin models and entanglement dynamics in superconducting flux qubit systems
similarity 0.89Qian Qian Shi et al.
Source status unknown — claims are unverified
Decoherence in a superconducting flux qubit with a pi-junction
similarity 0.89T. Kato et al. · 2007 · arXiv:0708.2652
Source status unknown — claims are unverified
Relaxation and decoherence in a resonantly driven qubit
similarity 0.88Zhongyuan Zhou et al. · 2006 · arXiv:cond-mat/0604191
Source status unknown — claims are unverified
Macroscopic quantum tunneling in multigap superconducting Josephson junctions: Enhancement of escape rate via quantum fluctuations of the Josephson-Leggett mode
similarity 0.87Yukihiro Ota et al.
Source status unknown — claims are unverified
Coupling spin ensembles via superconducting flux qubits
similarity 0.87Yueyin Qiu et al.
Source status unknown — claims are unverified
Interplay between Coulomb blockade and Josephson effect in a topological superconductor–quantum dot device
similarity 0.87Yu-Li Lee & Yu-Wen Lee
Source status unknown — claims are unverified