) using MicrowaveTechniques*

Superconductors with high kinetic inductance at microwave frequencies can suppress charge fluctuations in quantum circuits. This property provides a platform for creating the so-called protected qubits such as fluxonium and zero-pi qubits as well as other quantum devices. In this experiment, we measure the kinetic inductance of thin (thickness <10 nm) NbSe₂, a van der Waals superconductor, by using circuit quantum electrodynamics (cQED) architecture. Thin NbSe₂ flakes, entirely encapsulated by hexagonal boron nitride (hBN), have been incorporated into a superconducting coplanar resonator. By measuring the resonance characteristics of this resonator in the low-temperature, low-photon number limit, we extract the kinetic inductance and the quality factor of this 2D crystalline superconductor. Our approach can be applied to study a wide variety of 2D superconductors relevant to constructing high coherence superconducting quantum circuits.