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Asymmetric superconducting quantum interference devices for suppression of phase diffusion in small Josephson junctions
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10.1063/1.4804057
/content/aip/journal/jap/113/18/10.1063/1.4804057
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804057

Figures

Image of FIG. 1.
FIG. 1.

Current-voltage (I-V) characteristic of a single, small (100 × 300 nm), Al-AlO-Al Josephson junction, measured at T = 30 mK. The absence of a zero voltage supercurrent branch is due to the small capacitance of the junction (C ≃ 5 fF) completely suppressing the critical current.

Image of FIG. 2.
FIG. 2.

I-V curve of an asymmetric dc SQUID, measured at T = 30 mK, with a small Josephson junction as in Fig. 1 . The supercurrent branch of magnitude ∼ 850 nA is evident.

Image of FIG. 3.
FIG. 3.

Photograph of asymmetric SQUID before bonding the two halves of the loop together. Junction J has an area ∼ 100 × 300 nm, and is shunted by an additional capacitance C ≃ 6 fF to help stabilize its phase, . Junction J has an approximate area of ∼ 1.25 × 0.5 m.

Image of FIG. 4.
FIG. 4.

Circuit schematic of asymmetric SQUID. The small junction J in the SQUID is shunted by an on-chip capacitance C ≃ 6 fF. The large junction J is shunted by its self-capacitance C.

Image of FIG. 5.
FIG. 5.

Switching current versus flux current (I(I)) data from the SQUID, taken at (a) T = 30 mK and (b) T = 250 mK. The color scale shows the number of switching events recorded out of 10 trials.

Image of FIG. 6.
FIG. 6.

Mean SQUID switching current at T = 250 mK (points), with a quadratic fit (red line) to account for device heating from the flux bias current, I. The solid black line is the data corrected for a parabolic offset due to Joule heating.

Tables

Generic image for table
Table I.

SQUID design parameters to enable small phase uncertainty inJ.

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/content/aip/journal/jap/113/18/10.1063/1.4804057
2013-05-10
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Asymmetric superconducting quantum interference devices for suppression of phase diffusion in small Josephson junctions
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804057
10.1063/1.4804057
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