Superconductor Science and Technology, volume 28, issue 2, pages 25009

Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters

A V Shcherbakova ¹

K. G. FEDOROV ^{2, 3}

K Shulga ²

V V Ryazanov ^{2, 4}

V.V. Bol'ginov ^{2, 4}

V.A. Oboznov ⁴

S. V. Egorov ⁴

V.O. Shkolnikov ^{4, 5}

M J Wolf ⁶

D. Beckmann ⁶

A.V. Ustinov ^{2, 3}

Hide authors affiliations Show authors affiliations: 6 affiliations

Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany |

National University of Science and Technology MISiS, Leninskiy prosp. 4, Moscow, 119049, Russia |

Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany |

⁴

Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia |

⁵

Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, Moscow Region, 141700, Russia |

⁶

Institut für Nanotechnologie, Karlsruhe Institute of Technology, D-76021 Karlsruhe,Germany |

Publication type: Journal Article

Publication date: 2015-01-13

IOP Publishing

Journal: Superconductor Science and Technology

Quartile SCImago

Quartile WOS

Impact factor: 3.6

ISSN: 09532048, 13616668

DOI: 10.1088/0953-2048/28/2/025009

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Materials Chemistry

Metals and Alloys

Ceramics and Composites

Condensed Matter Physics

Electrical and Electronic Engineering

Abstract

We describe fabrication and testing of composite flux qubits combining Nb- and Al-based superconducting circuit technology. This hybrid approach to making qubits allows for employing pi-phase shifters fabricated using well-established Nb-based technology of superconductor-ferromagnet-superconductor Josephson junctions. The important feature here is to obtain high interface transparency between Nb and Al layers without degrading sub-micron shadow mask. We achieve this by in-situ Ar etching using e-beam gun. Shadow-evaporated Al/AlOx/Al Josephson junctions with Nb bias pads show the expected current-voltage characteristics with reproducible critical currents. Using this technique, we fabricated composite Nb/Al flux qubits with Nb/CuNi/Nb pi-shifters and measured their magnetic field response. The observed offset between the field responses of the qubits with and without pi-junction is attributed to the pi phase shift. The reported approach can be used for implementing a variety of hybrid Nb/Al superconducting quantum circuits.

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Shcherbakova A. V. et al. Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters // Superconductor Science and Technology. 2015. Vol. 28. No. 2. p. 25009.

GOST all authors (up to 50) Copy

Shcherbakova A. V., FEDOROV K. G., Shulga K., Ryazanov V. V., Bol'ginov V., Oboznov V., Egorov S. V., Shkolnikov V., Wolf M. J., Beckmann D., Ustinov A. Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters // Superconductor Science and Technology. 2015. Vol. 28. No. 2. p. 25009.

RIS |

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RIS Copy

TY - JOUR

DO - 10.1088/0953-2048/28/2/025009

UR - https://doi.org/10.1088/0953-2048/28/2/025009

TI - Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters

T2 - Superconductor Science and Technology

AU - Shcherbakova, A V

AU - FEDOROV, K. G.

AU - Shulga, K

AU - Ryazanov, V V

AU - Bol'ginov, V.V.

AU - Oboznov, V.A.

AU - Egorov, S. V.

AU - Shkolnikov, V.O.

AU - Wolf, M J

AU - Beckmann, D.

AU - Ustinov, A.V.

PY - 2015

DA - 2015/01/13

PB - IOP Publishing

SP - 25009

IS - 2

VL - 28

SN - 0953-2048

SN - 1361-6668

ER -

BibTex |

Cite this

BibTex Copy

@article{2015_Shcherbakova,

author = {A V Shcherbakova and K. G. FEDOROV and K Shulga and V V Ryazanov and V.V. Bol'ginov and V.A. Oboznov and S. V. Egorov and V.O. Shkolnikov and M J Wolf and D. Beckmann and A.V. Ustinov},

title = {Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters},

journal = {Superconductor Science and Technology},

year = {2015},

volume = {28},

publisher = {IOP Publishing},

month = {jan},

url = {https://doi.org/10.1088/0953-2048/28/2/025009},

number = {2},

pages = {25009},

doi = {10.1088/0953-2048/28/2/025009}

}

MLA

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MLA Copy

Shcherbakova, A. V., et al. “Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits withπ-shifters.” Superconductor Science and Technology, vol. 28, no. 2, Jan. 2015, p. 25009. https://doi.org/10.1088/0953-2048/28/2/025009.

Found error?

Publisher

IOP Publishing

Journal

Superconductor Science and Technology

Quartile SCImago

Quartile WOS

Impact factor

3.6

ISSN

09532048 (Print)
13616668 (Electronic)

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