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Photon-mediated entanglement between spin qubits beyond the dispersive regime

Andrei I. Nikitchenko* and Guido Burkard†

  • *Contact author: andrei.nikitchenko@uni-konstanz.de
  • †Contact author: guido.burkard@uni-konstanz.de
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Phys. Rev. B 114, 045420 – Published 16 July, 2026

DOI: https://doi.org/10.1103/y6d1-nsxs

Abstract

Dispersively coupled distant qubits in a shared cavity can become entangled through virtual photon exchange with energy-conserving phase evolution of their quantum states. This interaction can potentially be accelerated by operating on resonance, allowing for the exchange of real photons. In this theoretical study, we examine photon-mediated entanglement between two distant spins of electrons confined in double quantum dots formed in a Si/SiGe heterostructure. We calculate the dynamics of the combined system comprised of both spin qubits and the cavity, assuming that both spin qubits can be tuned into and out of resonance with the host cavity. We demonstrate that the exchange of real photons between the two spin qubits can result in rapid entanglement that is robust against decoherence. These results pave the way for the development of quantum gates on resonantly coupled distant semiconductor spin qubits.

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Phys. Rev. B 114, 045420– Published 16 July, 2026
  • Received 13 March 2026
  • Revised 14 May 2026
  • Accepted 23 June 2026
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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.

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