Portable and integrated entanglement sources for quantum communication

Tiphaine Kouadou, Paul G. Kwiat

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


We present integrated sources of polarization entanglement built on portable platforms for quantum communication. We employ type-II degenerate spontaneous parametric down conversion processes in periodically poled potassium titanyl phosphate (PPKTP) waveguides to generate pairs of orthogonally polarized photons at near-infrared wavelengths. We use balanced non-polarizing beam splitter (NPBS) to generate post-selected polarization-entangled states via coincidence measurements and investigate the power and spectral tunability of the system. The small size of the waveguides allows the installation of several units on the same platform, and thereby the generation of multiple entangled states simultaneously. We built a separate platform containing a computer-controlled tomography system to characterize the produced states and another NPBS is installed to combine photons from adjacent waveguides and assess their interferability, a prerequisite to entanglement swapping. The overall experiment is compact and requires little alignment when set, making it an attractive option for local quantum networking using mobile platforms, e.g., drones or satellites.

Original languageEnglish (US)
Title of host publicationQuantum Communications and Quantum Imaging XXI
EditorsKeith S. Deacon, Ronald E. Meyers
ISBN (Electronic)9781510665989
StatePublished - 2023
EventQuantum Communications and Quantum Imaging XXI 2023 - San Diego, United States
Duration: Aug 21 2023Aug 22 2023

Publication series

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


ConferenceQuantum Communications and Quantum Imaging XXI 2023
Country/TerritoryUnited States
CitySan Diego


  • Quantum information
  • entanglement swapping
  • nonlinear optics
  • quantum optics

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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