• Open Access

Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits

Jorge Cayao, Mónica Benito, and Guido Burkard
Phys. Rev. B 101, 195438 – Published 26 May 2020

Abstract

Recent achievements in the field of gate-defined semiconductor quantum dots reinforce the concept of a spin-based quantum computer consisting of nodes of locally connected qubits which communicate with each other via superconducting circuit resonator photons. In this paper, we theoretically demonstrate a versatile set of quantum gates between adjacent spin qubits defined in semiconductor quantum dots situated within the same node of such a spin-based quantum computer. The electric dipole acquired by the spin of an electron that moves across a double quantum dot potential in a magnetic field gradient has enabled strong coupling to resonator photons and low-power spin control. Here we show that this flopping-mode spin qubit also provides the tunability to program multiple two-qubit gates. Since the capacitive coupling between these qubits brings about additional dephasing, we calculate the estimated infidelity of different two-qubit gates in the most immediate possible experimental realizations.

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  • Received 4 March 2020
  • Revised 11 May 2020
  • Accepted 12 May 2020
  • Corrected 23 July 2020

DOI:https://doi.org/10.1103/PhysRevB.101.195438

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Corrections

23 July 2020

Correction: The title contained a misspelled word and has been fixed.

Authors & Affiliations

Jorge Cayao1,2, Mónica Benito2, and Guido Burkard2

  • 1Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
  • 2Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Article Text

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Issue

Vol. 101, Iss. 19 — 15 May 2020

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