University of Illinois Urbana-Champaign

Multidimensional fiber quantum light sources and their applications

Kim, Dong Beom

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https://hdl.handle.net/2142/132620

Description

Title
Multidimensional fiber quantum light sources and their applications
Author(s)
Kim, Dong Beom
Issue Date
2025-09-04
Director of Research (if dissertation) or Advisor (if thesis)
Lorenz, Virginia O
Doctoral Committee Chair(s)
Kwiat, Paul G
Committee Member(s)
  • Goldschmidt, Elizabeth A
  • Garay-Palmett, Karina
  • Backlund, Mikael P
  • U'ren, Alfred B
  • Ramachandran, Siddharth
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • multidimensional
  • optical fiber
  • quantum information
  • photon-pair source
  • spontaneous four-wave mixing
  • SFWM
  • entanglement
  • transverse spatial mode
  • SLM
  • quantum communication
  • quantum metrology
Abstract
Optical fibers support discrete transverse spatial modes that have potential for applications in high-dimensional quantum information processing. When paired with other degrees of freedom such as spectral modes, fibers become a versatile platform for studying multidimensional quantum systems. In this thesis, we present our recent progress in fundamental studies and applications of multidimensional optical fiber-based quantum light sources. We study spontaneous four-wave mixing processes in optical fibers that can create photon pairs correlated in spatio-spectral degrees of freedom. Utilizing spatial light modulators, we show control over individual spontaneous four-wave mixing processes through precise beam shaping of the pump spatial mode. Employing stimulated emission and spatio-spectral control of the seed beam, we carefully characterize the photon pairs created from few-mode polarization-maintaining fibers. We develop spatial-mode quantum state tomography and quantum state estimation techniques and take steps towards generating spatial-mode-entangled photon pairs in a cross-spliced few-mode polarization-maintaining fiber. We elaborate on the spectro-temporal distinguishabilities that can challenge the entanglement generation and potential experimental remedies that can minimize them. Furthermore, we explore the scalability of our scheme in a ring-core fiber platform that is capable of supporting more than thirty different high-dimensional orbital angular momentum states. We control the spectral correlation of these photon pairs and measure their quantum source properties such as coincidence-to-accidental ratio and heralded second-order correlation function. Additionally, with a commercial telecom polarization-maintaining fiber, we conduct spectral and coincidence measurements to investigate and confirm the generation of telecom-infrared photon pairs that can be potentially integrated into quantum network infrastructure. Finally, we study the application of our fiber photon-pair sources for quantum imaging of biomolecules through scattering-robust fluorescence ghost imaging.
Graduation Semester
2025-12
Type of Resource
Thesis
Handle URL
https://hdl.handle.net/2142/132620
Copyright and License Information
Copyright 2025 Dong Beom Kim

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Graduate Theses and Dissertations at Illinois