Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 15, 2023 | Submitted
Report Open

Strong kinetic-inductance Kerr nonlinearity with titanium nitride nanowires

Abstract

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 ≃ 10⁻⁴ um³. Using this concept, we realize microwave-frequency Kerr cavities with a maximum Kerr-shift per photon of K/2π = 123.5 ± 3 kHz and report a nonlinearity-to-linewidth ratio K/γ = 21%. With improved design, our devices are expected to approach the regime of strong quantum nonlinearity in the millimeter-wave spectrum.

Additional Information

Attribution 4.0 International (CC BY 4.0). This work was supported by startup funds from the Caltech EAS division, a Braun trust grant, and the National Science Foundation (grant No. 1733907). C.J. gratefully acknowledges support from the IQIM/AWS Postdoctoral Fellowship. We acknowledge Niv Drucker from Quantum Machines for software support while performing the cavity ringdown measurements.

Attached Files

Submitted - 2208.00317.pdf

Files

2208.00317.pdf
Files (5.9 MB)
Name Size Download all
md5:2b70f4fcb69d8ea913325308c72225c6
5.9 MB Preview Download

Additional details

Created:
August 20, 2023
Modified:
October 20, 2023