Kinetic Inductance Measurement of NbSe2 Using Microwave Techniques

S. Zaman | J. I. J. Wang | M. Tanaka | D. Kim | A. J. Melville | B. M. Niedzielski | K. Serniak | M. E. Schwartz | K. Wantanabe | T. Taniguchi | T. P. Orlando | S. Gustavsson | P. Jarillo-Herrero | W. D. Oliver

Superconducting qubits are a leading qubit platform due to their extensibility, controllability, and high-fidelity gate operations. However, to realize the promise of quantum computation, further improvements in qubit coherence and extensibility will be required. This challenge can be addressed in part by using two-dimensional van der Waals (vdW) materials as superconductor in quantum circuits. Our experimental approach will measure the “kinetic inductance” and “superfluid density” of NbSe2 using circuit quantum electrodynamics (cQED) architecture.

High-quality vdW heretostructures enable the construction of small form-factor superconducting quantum devices by reducing the qubit area and exhibiting comparable coherence. NbSe2 is a 2D vdW material with individual atomic layers held together by weak, out-of-plane van der Waal forces, and it is also a good superconductor. Superconductors feature a substantial kinetic inductance, essentially the kinetic energy stored in the supercurrent and related to the superfluid density of the Cooper pairs. We can calculate the kinetic inductance of NbSe2 by measuring the frequency shift of a standard Aluminum coplanar waveguide resonator terminated by NbSe2. Understanding the kinetic inductance of NbSe2 enables the design of merged-element t

Funding Sources: Laboratory for Physical Sciences (LPS)