Optimized heralding schemes for single photons

Yu Ping Huang*, Joseph B. Altepeter, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


A major obstacle to a practical, heralded source of single photons is the fundamental trade-off between high purity and high production rate. To overcome this difficulty, we propose applying sequential spectral and temporal filtering on the signal photons before they are detected for heralding. Based on a multimode theory that takes into account the effect of simultaneous multiple photon-pair emission, we find that these filters can be optimized to yield both high purity and a high production rate. While the optimization conditions vary depending on the underlying photon-pair spectral correlations, all correlation profiles can lead to similarly high performance levels when optimized filters are employed. This suggests that a better strategy for improving the performance of heralded single-photon sources is to adopt an appropriate measurement scheme for the signal photons, rather than tailoring the properties of the photon-pair generation medium.

Original languageEnglish (US)
Article number033844
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
StatePublished - Sep 20 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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