Kavli Affiliate: Mohammad Mirhosseini
| First 5 Authors: Chaitali Joshi, Wenyuan Chen, Henry G. LeDuc, Peter K. Day, Mohammad Mirhosseini
| Summary:
Thin films of disordered superconductors such as titanium nitride (TiN)
exhibit large kinetic inductance (KI), high critical temperature, and large
quality factors at the single-photon level. KI nonlinearity can be exploited as
an alternative to Josephson junctions for creating novel nonlinear quantum
devices with the potential to operate at higher frequencies and at elevated
temperatures. We study a means of magnifying KI nonlinearity by confining the
current density of resonant electromagnetic modes in nanowires with a small
volume $V simeq 10^{-4}text{um}^3$. Using this concept, we realize
microwave-frequency Kerr cavities with a maximum Kerr-shift per photon of
$K/2pi = 123.5 pm 3$ kHz and report a nonlinearity-to-linewidth ratio
$K/gamma = 21%$. With improved design, our devices are expected to approach
the regime of strong quantum nonlinearity in the millimeter-wave spectrum.
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