Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots
Sprache des Titels:
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.