Hexagonal boron nitride as a low-loss dielectric for superconducting quantum circuits and qubits
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2109.00015.pdf
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Author(s)
Wang, Joel I-J
Yamoah, Megan A
Li, Qing
Karamlou, Amir H
Dinh, Thao
Kannan, Bharath
Braumüller, Jochen
Kim, David
Melville, Alexander J
Muschinske, Sarah E
Date Issued
April 2022
Journal
Nature Materials
Publisher
Springer Science and Business Media LLC
Citation
Wang, Joel I-J, Yamoah, Megan A, Li, Qing, Karamlou, Amir H, Dinh, Thao et al. 2022. "Hexagonal boron nitride as a low-loss dielectric for superconducting quantum circuits and qubits." Nature Materials, 21 (4).
Version
Author's final manuscript
Abstract
Dielectrics with low loss at microwave frequencies are imperative for
high-coherence solid-state quantum computing platforms. We study the dielectric
loss of hexagonal boron nitride (hBN) thin films in the microwave regime by
measuring the quality factor of parallel-plate capacitors (PPCs) made of
NbSe$_{2}$-hBN-NbSe$_{2}$ heterostructures integrated into superconducting
circuits. The extracted microwave loss tangent of hBN is bounded to be at most
in the mid-10$^{-6}$ range in the low temperature, single-photon regime. We
integrate hBN PPCs with aluminum Josephson junctions to realize transmon qubits
with coherence times reaching 25 $\mu$s, consistent with the hBN loss tangent
inferred from resonator measurements. The hBN PPC reduces the qubit feature
size by approximately two-orders of magnitude compared to conventional
all-aluminum coplanar transmons. Our results establish hBN as a promising
dielectric for building high-coherence quantum circuits with substantially
reduced footprint and, with a high energy participation that helps to reduce
unwanted qubit cross-talk.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Lincoln Laboratory
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DOI of Published Version
https://doi.org/10.1038/s41563-021-01187-w
