Mitigation of critical current fluctuation of Josephson junctions in superconducting quantum circuits

2021 ◽  
Vol 118 (24) ◽  
pp. 244004
Author(s):  
Shuqing Song ◽  
Yuting Sun ◽  
Jianwen Xu ◽  
Zhikun Han ◽  
Xiaopei Yang ◽  
...  
Keyword(s):  
Critical Current ◽  
Josephson Junctions ◽  
Quantum Circuits ◽  
Current Fluctuation ◽  
Superconducting Quantum Circuits

scholarly journals Fully in situ Nb/InAs-nanowire Josephson junctions by selective-area growth and shadow evaporation

2021 ◽  
Author(s):  
Pujitha Perla ◽  
H. Aruni Fonseka ◽  
Patrick Zellekens ◽  
Russell Deacon ◽  
Yisong Han ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Josephson Junctions ◽  
Quantum Circuits ◽  
Selective Area Growth ◽  
Selective Area ◽  
Area Growth ◽  
Shadow Evaporation ◽  
Superconducting Quantum Circuits

Nb/InAs-nanowire Josephson junctions are fabricated in situ by a special shadow evaporation scheme for the superconducting Nb electrode. The junctions are interesting candidates for superconducting quantum circuits requiring large magnetic fields.

Improvement of Critical Current Density Uniformity for Interface-Modified Josephson Junctions in Single Flux Quantum Circuits

2006 ◽  
Vol 45 (No. 4) ◽  
pp. L105-L107 ◽  
Author(s):  
Hironori Wakana ◽  
Seiji Adachi ◽  
Yoshinobu Tarutani ◽  
Koji Tsubone ◽  
Kohei Nakayama ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Josephson Junctions ◽  
Quantum Circuits ◽  
Flux Quantum

scholarly journals Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Jared B. Hertzberg ◽  
Eric J. Zhang ◽  
Sami Rosenblatt ◽  
Easwar Magesan ◽  
John A. Smolin ◽  
...  
Keyword(s):  
Statistical Modeling ◽  
Josephson Junctions ◽  
Laser Annealing ◽  
Quantum Systems ◽  
Quantum Circuits ◽  
Fixed Frequency ◽  
Superconducting Quantum Circuits

AbstractAs superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly tenfold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of “frequency collisions” that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that, without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However, with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.

scholarly journals Andreev Probe of Persistent Current States in Superconducting Quantum Circuits

2005 ◽  
Vol 95 (14) ◽  
Author(s):  
V. T. Petrashov ◽  
K. G. Chua ◽  
K. M. Marshall ◽  
R. Sh. Shaikhaidarov ◽  
J. T. Nicholls
Keyword(s):  
Persistent Current ◽  
Quantum Circuits ◽  
Superconducting Quantum Circuits

scholarly journals Free-mode removal and mode decoupling for simulating general superconducting quantum circuits

2021 ◽  
Vol 103 (17) ◽  
Author(s):  
Dawei Ding ◽  
Hsiang-Sheng Ku ◽  
Yaoyun Shi ◽  
Hui-Hai Zhao
Keyword(s):  
Quantum Circuits ◽  
Free Mode ◽  
Superconducting Quantum Circuits

Effective gauge potentials induced by superconducting quantum circuits

2011 ◽  
Vol 375 (4) ◽  
pp. 808-811 ◽  
Author(s):  
Zhi-Bo Feng ◽  
An-Mei Wang ◽  
Run-Ying Yan
Keyword(s):  
Quantum Circuits ◽  
Superconducting Quantum Circuits

Low-frequency critical current noise in Josephson junctions induced by temperature fluctuations

2012 ◽  
Vol 101 (9) ◽  
pp. 092601 ◽  
Author(s):  
S. M. Anton ◽  
C. D. Nugroho ◽  
J. S. Birenbaum ◽  
S. R. O’Kelley ◽  
V. Orlyanchik ◽  
...  
Keyword(s):  
Critical Current ◽  
Josephson Junctions ◽  
Low Frequency ◽  
Temperature Fluctuations ◽  
Current Noise
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