2026-09-19T17:54:36Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/132620 2026-03-24 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

application/pdf en text Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-12-01 The student, Dong Beom Kim, accepted the attached license on 2025-09-03 at 16:09. The student, Dong Beom Kim, submitted this Dissertation for approval on 2025-09-03 at 16:35. This Dissertation was approved for publication on 2025-09-04 at 15:46. DSpace SAF Submission Ingestion Package generated from Vireo submission #22789 on 2026-02-19 at 18:45:22 Multidimensional fiber quantum light sources and their applications Kim, Dong Beom 2025-09-04 Lorenz, Virginia O Kwiat, Paul G Goldschmidt, Elizabeth A Garay-Palmett, Karina Backlund, Mikael P U'ren, Alfred B Ramachandran, Siddharth multidimensional optical fiber quantum information photon-pair source spontaneous four-wave mixing SFWM entanglement transverse spatial mode SLM quantum communication quantum metrology eng 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. 2025-12 Thesis https://hdl.handle.net/2142/132620 Copyright 2025 Dong Beom Kim Physics Physics University of Illinois Urbana-Champaign Ph.D. Dissertation