Quantum-memory-assisted multi-photon generation for efficient quantum information processing

Fumihiro Kaneda, Feihu Xu, Joseph Chapman, Paul G. Kwiat

Research output: Contribution to journalLetterpeer-review

66 Citations (Scopus)


Efficient preparation of large, but definite, numbers of photons is of great importance for scaling up and speeding up photonic quantum information processing. Typical single-photon generation techniques based on nonlinear parametric processes face challenges of probabilistic generation. Here we demonstrate efficient synchronization of photons from multiple nonlinear parametric heralded single-photon sources, using quantum memories. Our low-loss optical memories greatly enhance (∼30×) the generation rate of coincidence photons from two independent sources, while maintaining high indistinguishability (95.7±1.4%) of the synchronized photons. As an application, we perform the first demonstration of parametric-source-based measurement-device-independent quantum key distribution. The synchronization technique demonstrated here paves the way toward efficient quantum communication and larger-scale optical quantum computing.

Original languageEnglish
Pages (from-to)1034-1037
Number of pages4
Issue number9
Publication statusPublished - 2017 Sept 20


  • Photon statistics
  • Quantum communications
  • Quantum information and processing
  • Quantum optics


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