Portable integrated quantum optics for quantum communication

Tiphaine Kouadou, David Diaz, 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 PPKTP waveguides to generate pairs of orthogonally polarized photons at near-infrared wavelengths. The photons are sent to a 50/50 non-polarizing beam splitter (NPBS) to generate post-selected polarization-entangled states via coincidence measurements. 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 use a computer-controlled tomography system to characterize the produced states and combine the photons from adjacent waveguides on another NPBS to perform Bell-state measurements, 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 publicationPhotonics for Quantum 2023
EditorsDonald F. Figer, Michael Reimer
ISBN (Electronic)9781510664753
StatePublished - 2023
EventPhotonics for Quantum 2023 - Rochester, United States
Duration: Jun 5 2023Jun 8 2023

Publication series

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


ConferencePhotonics for Quantum 2023
Country/TerritoryUnited States


  • 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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