{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/125691"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/125691","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Applications of entanglement at extreme distance scales","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_has_math":false,"creators":["Johnson, Spencer James"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Kwiat, Paul","Lorenz, Virginia","Chitambar, Eric","Backlund, Mikael"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-08","date_published":"2024-08","updated_at":"2026-07-22T22:25:02Z","subjects":["Quantum Information","Quantum Optics","Entanglement","Quantum Sensing","Quantum Networking"],"languages":["en","eng"],"rights":["Copyright 2024 Spencer Johnson"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/125691","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kwiat, Paul","Lorenz, Virginia","Chitambar, Eric","Backlund, Mikael"]},{"key":"dc:creator","label":"Author","values":["Johnson, Spencer James"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-08","2024-07-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Quantum Information","Quantum Optics","Entanglement","Quantum Sensing","Quantum Networking"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2024 Spencer Johnson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/125691"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Spencer Johnson, accepted the attached license on 2024-07-03 at 15:37.","The student, Spencer Johnson, submitted this Dissertation for approval on 2024-07-03 at 16:05.","This Dissertation was approved for publication on 2024-07-08 at 13:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20941 on 2025-02-04 at 21:16:18","Entanglement, a unique feature of quantum mechanics in which two particles share correlations beyond what is possible classically, can be exploited for gains in sensing, communication, and computation. It can be used to connect quantum computers and sensors on a global scale and beyond, or for better sensing of the most sensitive phenomena. Here we will explore three such applications of entangled photons across a range of distance scales: First, a sensor which utilizes frequency entanglement to measure nanometer-scale displacements and vibrations with orders of magnitude fewer resources than traditional quantum approaches. We perform a theoretical study of noise in interferometry, comparing the effects of common noise sources on classical interference, degenerate two-photon interference, and frequency-entangled two-photon interference. We then construct a component-based noise model of such a frequency-entangled interferometer, which is used to predict performance of our experimental system based on real-world optics. Our experimental implementation of such an interferometer, utilizing frequency-entangled photon pairs at 810 nm and 1550 nm, is demonstrated to have two-photon interference visibility > 0.89, corresponding to a 88.6% saturation of the Quantum Cramér-Rao bound when used for metrology. Second, we present a theoretical model for noisy fiber- and space-based quantum networks, used to optimize network rates for inter/trans continental entanglement distribution. We study the effects of noise on swapping rates and finalized state quality, comparing different source technologies, detection methods, and link architectures. Finally, we discuss efforts to create a compact postselected entanglement source and integrated tomography system suitable for a space environment. Using a novel quantum-state tomography system consisting of only a single liquid crystal variable retarder per photon, we characterize the source, demonstrating entanglement fidelities in excess of 99%."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Applications of entanglement at extreme distance scales"]}]}],"canonical_facts":{"dc:contributor":["Kwiat, Paul","Lorenz, Virginia","Chitambar, Eric","Backlund, Mikael"],"dc:creator":["Johnson, Spencer James"],"dc:date":["2024-08","2024-07-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Spencer Johnson, accepted the attached license on 2024-07-03 at 15:37.","The student, Spencer Johnson, submitted this Dissertation for approval on 2024-07-03 at 16:05.","This Dissertation was approved for publication on 2024-07-08 at 13:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20941 on 2025-02-04 at 21:16:18","Entanglement, a unique feature of quantum mechanics in which two particles share correlations beyond what is possible classically, can be exploited for gains in sensing, communication, and computation. It can be used to connect quantum computers and sensors on a global scale and beyond, or for better sensing of the most sensitive phenomena. Here we will explore three such applications of entangled photons across a range of distance scales: First, a sensor which utilizes frequency entanglement to measure nanometer-scale displacements and vibrations with orders of magnitude fewer resources than traditional quantum approaches. We perform a theoretical study of noise in interferometry, comparing the effects of common noise sources on classical interference, degenerate two-photon interference, and frequency-entangled two-photon interference. We then construct a component-based noise model of such a frequency-entangled interferometer, which is used to predict performance of our experimental system based on real-world optics. Our experimental implementation of such an interferometer, utilizing frequency-entangled photon pairs at 810 nm and 1550 nm, is demonstrated to have two-photon interference visibility > 0.89, corresponding to a 88.6% saturation of the Quantum Cramér-Rao bound when used for metrology. Second, we present a theoretical model for noisy fiber- and space-based quantum networks, used to optimize network rates for inter/trans continental entanglement distribution. We study the effects of noise on swapping rates and finalized state quality, comparing different source technologies, detection methods, and link architectures. Finally, we discuss efforts to create a compact postselected entanglement source and integrated tomography system suitable for a space environment. Using a novel quantum-state tomography system consisting of only a single liquid crystal variable retarder per photon, we characterize the source, demonstrating entanglement fidelities in excess of 99%."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/125691"],"dc:language":["en","eng"],"dc:rights":["Copyright 2024 Spencer Johnson"],"dc:subject":["Quantum Information","Quantum Optics","Entanglement","Quantum Sensing","Quantum Networking"],"dc:title":["Applications of entanglement at extreme distance scales"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:02Z"}