Quantum dot single-photon sources with ultra-low multi-photon probability Journal Article uri icon



  • AbstractHigh-quality sources of single photons are of paramount importance for quantum communication, sensing, and metrology. To these ends, resonantly excited two-level systems based on self-assembled quantum dots have recently generated widespread interest. Nevertheless, we have recently shown that for resonantly excited two-level systems, emission of a photon during the presence of the excitation laser pulse and subsequent re-excitation results in a degradation of the obtainable single-photon purity. Here, we demonstrate that generating single photons from self-assembled quantum dots with a scheme based on two-photon excitation of the biexciton strongly suppresses the re-excitation. Specifically, the pulse-length dependence of the multi-photon error rate reveals a quadratic dependence in contrast to the linear dependence of resonantly excited two-level systems, improving the obtainable multi-photon error rate by several orders of magnitude for short pulses. We support our experiments with a new theoretical framework and simulation methodology to understand few-photon sources.

publication date

  • September 14, 2018

Date in CU Experts

  • January 13, 2021 6:35 AM

Full Author List

  • Hanschke L; Fischer KA; Appel S; Lukin D; Wierzbowski J; Sun S; Trivedi R; Vučković J; Finley JJ; Müller K

author count

  • 10

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 2056-6387

Additional Document Info


  • 4


  • 1


  • 43