High-fidelity entangling gates for quantum-dot hybrid qubits based on exchange interactions

Yuan-Chi Yang, S. N. Coppersmith, and Mark Friesen
Phys. Rev. A 101, 012338 – Published 23 January 2020

Abstract

Quantum-dot hybrid qubits exploit an extended charge-noise sweet spot that suppresses dephasing and has enabled the experimental achievement of high-fidelity single-qubit gates. However, current proposals for two-qubit gates require tuning the qubits away from their sweet spots. Here, we propose a two-hybrid-qubit coupling scheme, based on exchange interactions, that allows the qubits to remain at their sweet spots at all times. The interaction is controlled via the interqubit tunnel coupling. By simulating such gates in the presence of realistic quasistatic and 1/f charge noise, we show that our scheme should enable controlled-Z gates of length 5ns, and zero-controlled-not gates of length 7ns, both with fidelities >99.9%.

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  • Received 7 October 2019

DOI:https://doi.org/10.1103/PhysRevA.101.012338

©2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuan-Chi Yang1,*, S. N. Coppersmith1,2,†, and Mark Friesen1,‡

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 2School of Physics, The University of New South Wales, Sydney NSW 2052, Australia

  • *yjc1989@gmail.com
  • snc@physics.wisc.edu
  • friesen@physics.wisc.edu

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Issue

Vol. 101, Iss. 1 — January 2020

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