Purification of Single Photons by Temporal Heralding of Quantum Dot Sources

Hamza Abudayyeh, Boaz Lubotzky, Somak Majumder, Jennifer A. Hollingsworth, Ronen Rapaport*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Efficient, high rate photon sources with high single-photon purity are essential ingredients for quantum technologies. Single-photon sources based on solid state emitters such as quantum dots are very advantageous for integrated photonic circuits, but they can suffer from a high two-photon emission probability, which in cases of noncryogenic environment cannot be spectrally filtered. Here we propose two temporal purification-by-heralding methods for using a two-photon emission process to yield highly pure and efficient single-photon emission, bypassing the inherent problem of spectrally overlapping biphoton emission at elevated temperatures. We experimentally emulate their feasibility on the emission from a single nanocrystal quantum dot at room temperature, exhibiting single-photon purities exceeding 99.5%, without a significant loss of single-photon efficiency. By utilizing these methods with commercially available components, nanocrystal quantum dots can be made realistic high-quality room-temperature sources for single photons. These approaches can also be applied for any indeterministic source of spectrally broadband photon pairs.

Original languageAmerican English
Pages (from-to)446-452
Number of pages7
JournalACS Photonics
Issue number2
StatePublished - 20 Feb 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.


  • heralded single photons
  • nanocrystal quantum dots
  • nanophotonics
  • semiconductor nanocrystals
  • single photon purification
  • single photon source


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