Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
Name
PhysRevX.10.041051.pdf
Description
Published version
Size
777.52 KB
Format
Adobe PDF
Checksum (MD5)
d0903d3d12a782fabd5b0a0fc7416090
Author(s)
Campbell, Daniel L
Shim, Yun-Pil
Kannan, Bharath
Winik, Roni
Kim, David K
Melville, Alexander
Niedzielski, Bethany M
Yoder, Jonilyn L
Tahan, Charles
Gustavsson, Simon
Date Issued
2020
Journal
Physical Review X
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 authors. Published by the American Physical Society. Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an equivalence that emerges in quantum mechanics. While successful at controlling natural and artificial quantum systems, certain limitations may arise (e.g., the achievable gate speed) due to nonidealities like the counterrotating term. We introduce a superconducting composite qubit (CQB), formed from two capacitively coupled transmon qubits, which features a small avoided crossing - smaller than the environmental temperature - between two energy levels. We control this low-frequency CQB using solely baseband pulses, nonadiabatic transitions, and coherent Landau-Zener interference to achieve fast, high-fidelity, single-qubit operations with Clifford fidelities exceeding 99.7%. We also perform coupled qubit operations between two low-frequency CQBs. This work demonstrates that universal nonadiabatic control of low-frequency qubits is feasible using solely baseband pulses.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevX.10.041051
