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  • Open Access

Spin-photon entanglement dynamics under cavity-delayed feedback

Noam Tur and Ido Schwartz*

  • *Contact author: Idosch@technion.ac.il
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Phys. Rev. B 113, 115310 – Published 23 March, 2026

DOI: https://doi.org/10.1103/f4vf-nc9t

Abstract

We analytically study the interaction between a single confined spin with a four-level Π configuration in an optical cavity and a single photon. The spin's ground and excited manifolds are each split into two levels coupled by circularly polarized optical transitions. Starting from the spin in an excited state, we analyze the spontaneous emission of the photon, which leaves the spin and photon entangled, and then follow the subsequent time evolution of the system under delayed feedback. We examine how photon reabsorption depends on energy splittings in both the ground and excited spin states, and how the feedback delay influences the degree of spin-photon entanglement. Finally, we identify the conditions that maximize this entanglement after photon reabsorption and re-emission.

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Phys. Rev. B 113, 115310– Published 23 March, 2026
  • Received 29 August 2025
  • Revised 15 February 2026
  • Accepted 20 February 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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