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
Publication type: Journal Article
Publication date: 2015-01-13
scimago Q1
wos Q2
SJR: 1.095
CiteScore: 6.7
Impact factor: 4.2
ISSN: 09532048, 13616668
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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Total citations:
38
Citations from 2024:
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(28.95%)
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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.
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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.
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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 -
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@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}
}
Cite this
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.
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