Hyperfine-interaction limits polarization entanglement of photons from semiconductor quantum dots

• URL: http://arxiv.org/abs/2302.05983v3
• Date: Thu, 27 Apr 2023 09:43:31 GMT
• Title: Hyperfine-interaction limits polarization entanglement of photons from semiconductor quantum dots
• Authors: Christian Schimpf, Francesco Basso Basset, Maximilian Aigner, Wolfgang Atteneder, Laia G\'ines, Gabriel Undeutsch, Marcus Reindl, Daniel Huber, Dorian Gangloff, Evgeny Chekhovich, Christian Schneider, Sven H\"ofling, Ana Predojevi\'c, Rinaldo Trotta and Armando Rastelli
• Abstract summary: We show that spin-noise is often the dominant process limiting the entanglement in InGaAs quantum dots. Our results are consistent with all available literature, and suggest routes to alleviate its effect.
• Score: 0.18785242038982533
• License: http://creativecommons.org/licenses/by-sa/4.0/
• 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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