The exceptional quality of hexagonal boron nitride crystals that can be cleaved into few layers provides ultrathin dielectrics, thereby opening a route to ultrasmall capacitors with large capacitances. With such capacitors, the superconducting transmon qubit is scaled down by orders of magnitude.
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Schönenberger, C. 2D materials shrink superconducting qubits. Nat. Mater. 21, 381–382 (2022). https://doi.org/10.1038/s41563-022-01220-6