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

Shiro Kawabata; Alexandre A. Golubov

doi:10.1016/j.physe.2007.06.032

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

Shiro Kawabata
, Alexandre A. Golubov

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic › peer-review

12 Citations (Scopus)

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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.

Original language	English
Pages (from-to)	386-389
Journal	Physica E
Volume	40
Issue number	2
DOIs	https://doi.org/10.1016/j.physe.2007.06.032
Publication status	Published - 2007

Keywords

Spintronics
Quantum computer
Macroscopic quantum tunneling
Josephson effect

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10.1016/j.physe.2007.06.032

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title = "Macroscopic quantum tunneling in Josephson π 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.",

keywords = "Spintronics, Quantum computer, Macroscopic quantum tunneling, Josephson effect",

author = "Shiro Kawabata and Golubov, \{Alexandre A.\}",

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AU - Kawabata, Shiro

AU - Golubov, Alexandre A.

PY - 2007

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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 - Quantum computer

KW - Macroscopic quantum tunneling

KW - Josephson effect

U2 - 10.1016/j.physe.2007.06.032

DO - 10.1016/j.physe.2007.06.032

M3 - Article

SN - 1386-9477

VL - 40

SP - 386

EP - 389

JO - Physica E

JF - Physica E

IS - 2

ER -

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

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