On-chip analysis of time-bin encoded photons

Ujaan Purakayastha, Benjamin E. Nussbaum, John C. Floyd, Christopher C. Evans, Joel M. Hensley, Paul G. Kwiat

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


Two main challenges for quantum networks are state preservation and scaling current infrastructure. Photonic polarization qubits are susceptible to effective decoherence via polarization mode dispersion in optical fibers. This can be circumvented by encoding qubits in the photon's arrival time, i.e., time-bin encoding. Here, we present measurements on a thin-film lithium niobate integrated-optic device, designed to analyze telecom-wavelength photonic time-bin qubits. By thermo-optically tuning the phase and amplitudes of interfering processes traversing the photonic circuit on the device, we are able to obtain ∼ 83% interference visibility, marking significant progress towards efficient time-bin encoding and analysis with integrated photonics.

Original languageEnglish (US)
Title of host publicationQuantum Computing, Communication, and Simulation III
EditorsPhilip R. Hemmer, Alan L. Migdall
ISBN (Electronic)9781510659971
StatePublished - 2023
Externally publishedYes
EventQuantum Computing, Communication, and Simulation III 2023 - San Francisco, United States
Duration: Jan 29 2023Feb 2 2023

Publication series

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


ConferenceQuantum Computing, Communication, and Simulation III 2023
Country/TerritoryUnited States
CitySan Francisco


  • integrated-optic
  • photonics
  • telecom
  • time-bin

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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