Decoherence in a superconducting flux qubit with a pi-junction

T. Kato; T. Kato; Alexandre Avraamovitch Golubov; Y. Nakamura

doi:10.1103/PhysRevB.76.172502

Decoherence in a superconducting flux qubit with a pi-junction

T. Kato, T. Kato, Alexandre Avraamovitch Golubov, Y. Nakamura

Faculty of Science and Technology

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

35 Citations (Scopus)

185 Downloads (Pure)

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.

Original language	Undefined
Pages (from-to)	172502-
Journal	Physical review B: Condensed matter and materials physics
Volume	76
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.76.172502
Publication status	Published - 2007

Keywords

METIS-242858
IR-58278

Access to Document

10.1103/PhysRevB.76.172502

decoherence

Cite this

@article{7dd3da8afc314cd8bdcc3e042c12fa70,

title = "Decoherence in a superconducting flux qubit with a pi-junction",

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.",

keywords = "METIS-242858, IR-58278",

author = "T. Kato and T. Kato and Golubov, \{Alexandre Avraamovitch\} and Y. Nakamura",

year = "2007",

doi = "10.1103/PhysRevB.76.172502",

language = "Undefined",

volume = "76",

pages = "172502--",

journal = "Physical review B: Condensed matter and materials physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "17",

}

TY - JOUR

T1 - Decoherence in a superconducting flux qubit with a pi-junction

AU - Kato, T.

AU - Golubov, Alexandre Avraamovitch

AU - Nakamura, Y.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - METIS-242858

KW - IR-58278

U2 - 10.1103/PhysRevB.76.172502

DO - 10.1103/PhysRevB.76.172502

M3 - Article

SN - 1098-0121

VL - 76

SP - 172502-

JO - Physical review B: Condensed matter and materials physics

JF - Physical review B: Condensed matter and materials physics

IS - 17

ER -