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

Shiro Kawabata, S. Kawabata, Alexandre Avraamovitch Golubov

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

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.
Original languageUndefined
Pages (from-to)386-
JournalPhysica E
Volume40
Issue number2
DOIs
Publication statusPublished - 2007

Keywords

  • Spintronics
  • IR-78860
  • Quantum computer
  • Macroscopic quantum tunneling
  • METIS-243145
  • Josephson effect

Cite this

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title = "Macroscopic quantum tunneling in Josephson pi-junctions with insulating ferromagnets and its application to phase qubits",
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.",
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author = "Shiro Kawabata and S. Kawabata and Golubov, {Alexandre Avraamovitch}",
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language = "Undefined",
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Macroscopic quantum tunneling in Josephson pi-junctions with insulating ferromagnets and its application to phase qubits. / Kawabata, Shiro; Kawabata, S.; Golubov, Alexandre Avraamovitch.

In: Physica E, Vol. 40, No. 2, 2007, p. 386-.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Macroscopic quantum tunneling in Josephson pi-junctions with insulating ferromagnets and its application to phase qubits

AU - Kawabata, Shiro

AU - Kawabata, S.

AU - Golubov, Alexandre Avraamovitch

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Spintronics

KW - IR-78860

KW - Quantum computer

KW - Macroscopic quantum tunneling

KW - METIS-243145

KW - Josephson effect

U2 - 10.1016/j.physe.2007.06.032

DO - 10.1016/j.physe.2007.06.032

M3 - Article

VL - 40

SP - 386-

JO - Physica E

JF - Physica E

SN - 1386-9477

IS - 2

ER -