In superconducting circuits, a nonlinear element is necessary for making finite dimension quantum systems such as qubits. A nonlinearity is also necessary for making quantum limited amplifiers which are crucial for reading out qubits. The usual source of nonlinearity in a quantum circuit is a Josephson Junction which can be difficult to fabricate. Materials demonstrating large nonlinear kinetic inductances have made it possible to begin making quantum circuits without the need for Josephson Junctions to provide the nonlinearity. This JC will cover 3 papers. The first will introduce kinetic inductance and derive relationships that are compared to experimental results. The next two papers will present two circuit devices, a parametric amplifier and fluxonium qubit, which using the nonlinearity provided by kinetic inductance are fabricated sans Josephson Junctions.
Note: this event will be hybrid. The live talk occurring in Loomis 276 will be simultaneously broadcast via Zoom. The Zoom link will be sent to the Graduate Student and PDRA mailing lists. If you are not on one of those lists and are interested in attending, please email Caitlin at ckengle2@illinois.edu for the link.
