Compact entanglement sources for portable quantum information platforms

Tiphaine Kouadou, Colin P. Lualdi, Spencer Johnson, Kristina Meier, Josh Aller, Brad Slezak, Tony Roberts, Phil Battle, Paul G. Kwiat

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We discuss two novel entanglement sources utilizing spontaneous parametric downconversion in periodically poled waveguides. Using quasi-phase matched KTP crystals, we have demonstrated a post-selection-based polarization entangled degenerate source at 810 nm, as well as a post-selection-free non-degenerate collinear source producing entangled photons at 810 nm and 1550 nm. The sources exhibit high brightness and state quality - with the non-degenerate source achieving fidelities and purities up to 99% - with clear paths for further improvement. Furthermore, they are compact, stable, and need little alignment when set, critical for practical quantum communication and network applications. Lastly, their small size, weight, and power (SWaP) makes them an attractive option for mobile platforms, e.g., with drones or satellites.

Original languageEnglish (US)
Title of host publicationQuantum Computing, Communication, and Simulation II
EditorsPhilip R. Hemmer, Alan L. Migdall
ISBN (Electronic)9781510649019
StatePublished - 2022
Externally publishedYes
EventQuantum Computing, Communication, and Simulation II 2022 - Virtual, Online
Duration: Feb 20 2022Feb 24 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceQuantum Computing, Communication, and Simulation II 2022
CityVirtual, Online


  • compact sources
  • entanglement
  • nonlinear optics
  • quantum information
  • space-based quantum cryptography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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