Progress toward high-efficiency single-photon-level interactions in crystalline microcavities

Abijith S. Kowligy, Gregory S. Kanter, Prem Kumar

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


Low-loss nano- and micro-photonic platforms provide strong optical confinement and as a result enhance the effective material nonlinearity by several orders of magnitude, making them appealing candidates for quantum nonlinear photonics. One such platform is based on high-Q crystalline whispering-gallery-mode (WGM) microresonators, which can provide for highly efficient three-wave mixing, where even a single photon has a strong effect. We present experimental progress on the fabrication of small microresonators (R≲100 μm) with Q-factors ≥ 10 6 that are capable of supporting such strong coupling. We also demonstrate direct imaging of the spatial profiles of the WGMs, which is useful for identifying the phase-matched resonances of three-wave-mixing processes. Additionally, we present theoretical modeling of the cavity dynamics which suggests that single-photon-driven nonlinear processes are feasible in these crystalline microresonators. This crystalline WGM microresonator platform, therefore, can enable deterministic generation of non-classical light, including entangling gates for quantum information processing.

Original languageEnglish (US)
Title of host publicationQuantum Communications and Quantum Imaging XVI
EditorsRonald E. Meyers, Yanhua Shih, Keith S. Deacon
ISBN (Electronic)9781510621138
StatePublished - 2018
EventQuantum Communications and Quantum Imaging XVI 2018 - San Diego, United States
Duration: Aug 19 2018Aug 20 2018

Publication series

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


OtherQuantum Communications and Quantum Imaging XVI 2018
Country/TerritoryUnited States
CitySan Diego


  • Nonlinear optics
  • crystalline microresonators
  • entangled photons
  • quantum gates
  • quantum information processing
  • quantum optics
  • quantum photonics
  • single photons
  • whispering-gallery modes

ASJC Scopus subject areas

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


Dive into the research topics of 'Progress toward high-efficiency single-photon-level interactions in crystalline microcavities'. Together they form a unique fingerprint.

Cite this