Macroscopic quantum tunneling in π Josephson junctions with insulating ferromagnets and its application to phase qubits

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Kawabata, Shiro and Golubov, Alexander A. (2007) Macroscopic quantum tunneling in π Josephson junctions with insulating ferromagnets and its application to phase qubits. Physica E: Low-dimensional Systems and Nanostructures, 40 (2). pp. 386-389. ISSN 1386-9477

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Abstract:We theoretically investigate macroscopic quantum tunneling (MQT) in a current-biased π junction with a superconductor (S) and an insulating ferromagnet (IF). By using the functional integral method and the instanton approximation, the influence of the quasiparticle dissipation on MQT is found to be very weak. This feature makes it possible to realize a quantum information devices with high coherency. We also discuss how to make use of S–IF–S π junctions in the construction of a phase qubit.
Item Type:Article
Copyright:© 2007 Elsevier
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/78860
Official URL:http://dx.doi.org/10.1016/j.physe.2007.06.032
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Metis ID: 243145