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  • Schimpf, Christian, et al. (author)
  • Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots
  • 2023
  • In: Physical Review B. - 2469-9950 .- 2469-9969. ; 108:8
  • Journal article (peer-reviewed)abstract
    • Excitons in quantum dots are excellent sources of polarization-entangled photon pairs, but a quantitative understanding of their interaction with the nuclear spin bath is still missing. Here we investigate the role of hyperfine energy shifts using experimentally accessible parameters and derive an upper limit to the achievable entanglement fidelity. Our results are consistent with all available literature, indicate that spin noise is often the dominant process limiting the entanglement in InGaAs quantum dots, and suggest routes to alleviate its effect.
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