All-optical Ultrawide-bandwidth Quantum Buffer

Nathan T. Arnold, Michelle Victora, Michael E. Goggin, Paul G. Kwiat

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


Quantum optical memories are a key component in a variety of quantum information applications, from extending quantum communication channels to building high-efficiency single-photon sources to enabling protocols requiring multiple synchronized qubits. However, most current photon storage systems utilize light-matter interactions and are therefore not broadband; meanwhile the available broader-bandwidth photon storage systems operate with somewhat shorter storage times or require cryogenic operation. Here we develop a system with multiplexed free-space storage cavities, able to store single photons with high efficiency over variable delays, up to 12.5 μs, and over multiple nanometers bandwidth at room temperature. The system can store multiple qubits encoded in various degrees of freedom (e.g., time-bin, and polarization) simultaneously. The work presented here has demonstrated storage of polarization states for 1.25 μs and retrieval through single-mode fiber with a state fidelity >99% and efficiency 82%.

Original languageEnglish (US)
Title of host publicationPhotonics for Quantum 2021
ISBN (Electronic)9781510645264
StatePublished - 2021
EventPhotonics for Quantum 2021 - Virtual, Online, United States
Duration: Jul 12 2021Jul 16 2021

Publication series

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


ConferencePhotonics for Quantum 2021
Country/TerritoryUnited States
CityVirtual, Online


  • Delay Line
  • Herriott Cell
  • Quantum Buffer
  • Quantum Memory
  • Quantum Repeater

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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