Fully Tunable Longitudinal Spin-Photon Interactions in Si and Ge Quantum Dots

Stefano Bosco, Pasquale Scarlino, Jelena Klinovaja, and Daniel Loss
Phys. Rev. Lett. 129, 066801 – Published 2 August 2022
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Abstract

Spin qubits in silicon and germanium quantum dots are promising platforms for quantum computing, but entangling spin qubits over micrometer distances remains a critical challenge. Current prototypical architectures maximize transversal interactions between qubits and microwave resonators, where the spin state is flipped by nearly resonant photons. However, these interactions cause backaction on the qubit that yields unavoidable residual qubit-qubit couplings and significantly affects the gate fidelity. Strikingly, residual couplings vanish when spin-photon interactions are longitudinal and photons couple to the phase of the qubit. We show that large and tunable spin-photon interactions emerge naturally in state-of-the-art hole spin qubits and that they change from transversal to longitudinal depending on the magnetic field direction. We propose ways to electrically control and measure these interactions, as well as realistic protocols to implement fast high-fidelity two-qubit entangling gates. These protocols work also at high temperatures, paving the way toward the implementation of large-scale quantum processors.

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  • Received 31 March 2022
  • Accepted 6 July 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.066801

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Stefano Bosco1,*, Pasquale Scarlino2, Jelena Klinovaja1, and Daniel Loss1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • 2Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

  • *Corresponding author. stefano.bosco@unibas.ch

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Issue

Vol. 129, Iss. 6 — 5 August 2022

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