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Optimized cavity-mediated dispersive two-qubit gates between spin qubits

M. Benito, J. R. Petta, and Guido Burkard
Phys. Rev. B 100, 081412(R) – Published 29 August 2019
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Abstract

The recent realization of a coherent interface between a single electron in a silicon quantum dot and a single photon trapped in a superconducting cavity opens the way for implementing photon-mediated two-qubit entangling gates. In order to couple a spin to the cavity electric field, some type of spin-charge hybridization is needed, which impacts spin control and coherence. In this work we propose a cavity-mediated two-qubit gate and calculate cavity-mediated entangling gate fidelities in the dispersive regime, accounting for errors due to the spin-charge hybridization, as well as photon- and phonon-induced decays. By optimizing the degree of spin-charge hybridization, we show that two-qubit gates mediated by cavity photons are capable of reaching fidelities exceeding 90% in present-day device architectures. High iswap gate fidelities are achievable even in the presence of charge noise at the level of 2μeV.

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  • Received 20 February 2019
  • Revised 5 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.081412

©2019 American Physical Society

Physics Subject Headings (PhySH)

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

Authors & Affiliations

M. Benito1, J. R. Petta2, and Guido Burkard1

  • 1Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
  • 2Department of Physics, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 100, Iss. 8 — 15 August 2019

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