Tuning the inductance of Josephson junction arrays without SQUIDs
- URL: http://arxiv.org/abs/2210.12119v1
- Date: Fri, 21 Oct 2022 17:20:08 GMT
- Title: Tuning the inductance of Josephson junction arrays without SQUIDs
- Authors: Roman Kuzmin, Nitish Mehta, Nicholas Grabon, Vladimir E. Manucharyan
- Abstract summary: It is customary to use superconducting quantum interference devices (SQUIDs) for implementing magnetic field-tunable inductors.
Here, we demonstrate an equivalent tunability in a (SQUID-free) array of single Al/AlOx/Al Josephson tunnel junctions.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: It is customary to use arrays of superconducting quantum interference devices
(SQUIDs) for implementing magnetic field-tunable inductors. Here, we
demonstrate an equivalent tunability in a (SQUID-free) array of single
Al/AlOx/Al Josephson tunnel junctions. With the proper choice of junction
geometry, a perpendicularly applied magnetic field bends along the plane of the
superconductor and focuses into the tunnel barrier region due to a
demagnetization effect. Consequently, the Josephson inductance can be
efficiently modulated by the Fraunhoffer-type supercurrent interference. The
elimination of SQUIDs not only simplifies the device design and fabrication,
but also facilitates a denser packing of junctions and, hence, a higher
inductance per unit length. As an example, we demonstrate a transmission line,
the wave impedance of which is field-tuned in the range of
$4-8~\textrm{k}\Omega$, centered around the important value of the resistance
quantum $h/(2e)^2 \approx 6.5~\textrm{k}\Omega$.
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