Ultrastrong tunable coupler between superconducting LC resonators
- URL: http://arxiv.org/abs/2107.13175v3
- Date: Thu, 28 Oct 2021 03:05:21 GMT
- Title: Ultrastrong tunable coupler between superconducting LC resonators
- Authors: Takafumi Miyanaga, Akiyoshi Tomonaga, Hikaru Ito, Hiroto Mukai, and
Jaw-Shen Tsai
- Abstract summary: We investigate the ultrastrong tunable coupler for coupling of superconducting resonators.
The wide range tunability is achieved both antiferromagnetics and ferromagnetics from $-1086$ MHz to 604 MHz.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate the ultrastrong tunable coupler for coupling of
superconducting resonators. Obtained coupling constant exceeds 1 GHz, and the
wide range tunability is achieved both antiferromagnetics and ferromagnetics
from $-1086$ MHz to 604 MHz. The ultrastrong coupler is composed of rf-SQUID
and dc-SQUID as tunable junctions, which connected to resonators via shared
aluminum thin film meander lines enabling such a huge coupling constant. The
spectrum of the coupler obviously shows the breaking of the rotating wave
approximation, and our circuit model treating the Josephson junction as a
tunable inductance reproduces the experimental results well. The ultrastrong
coupler is expected to be utilized in quantum annealing circuits and/or NISQ
devices with dense connections between qubits.
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