{"ec_funded":1,"alternative_title":["ISTA Thesis"],"related_material":{"record":[{"status":"public","id":"8755","relation":"part_of_dissertation"}]},"article_processing_charge":"No","date_published":"2025-09-23T00:00:00Z","department":[{"_id":"GradSch"},{"_id":"JoFi"}],"date_updated":"2026-01-07T11:18:31Z","file_date_updated":"2025-09-26T07:20:48Z","file":[{"checksum":"6fb925648dfa5f4384814c552ee2f099","file_size":22351676,"date_created":"2025-09-25T07:15:05Z","file_name":"2025_Trioni_Andrea_Thesis.pdf","content_type":"application/pdf","file_id":"20392","access_level":"open_access","creator":"atrioni","date_updated":"2025-09-25T14:25:31Z","relation":"main_file"},{"access_level":"closed","file_id":"20396","content_type":"application/x-zip-compressed","file_name":"2025_Trioni_Andrea_Thesis.zip","date_created":"2025-09-25T14:45:43Z","file_size":60079009,"checksum":"619dc614bdfbf3999b76ac8890b2cebd","relation":"source_file","date_updated":"2025-09-26T07:20:48Z","creator":"atrioni"}],"year":"2025","_id":"20371","OA_place":"repository","day":"23","status":"public","project":[{"_id":"eb9b30ac-77a9-11ec-83b8-871f581d53d2","name":"Protected states of quantum matter"},{"name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","grant_number":"F07105","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f"},{"_id":"2564DBCA-B435-11E9-9278-68D0E5697425","grant_number":"665385","call_identifier":"H2020","name":"International IST Doctoral Program"}],"acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"date_created":"2025-09-23T09:57:57Z","publication_status":"published","has_accepted_license":"1","page":"202","oa":1,"ddc":["539"],"title":"High-impedance quantum circuits for mesoscopic physics : Geometric superinductors and insulating Josephson Chains","language":[{"iso":"eng"}],"abstract":[{"text":"Quantum mechanics reveals a world that defies classical determinism, where uncertainty, superposition, and fluctuations are fundamental aspects. Engineering devices that harness these quantum features requires not only precision, but also a deep understanding of how they interact with their surrounding environment. Superconducting circuits, which exploit\r\nmacroscopic quantum coherence in low-loss superconducting materials, provide a scalable platform for implementing such systems. Among the critical elements in these circuits, superinductors—high-impedance, dissipation-free inductive components—play a central role by suppressing charge fluctuations. They allow quantum states to be delocalized in phase space, protect qubits from environmental noise, and facilitate access to phenomena such as dual Josephson physics and ultra-strong coupling regimes. \r\nThis thesis explores two complementary implementations of high-impedance circuits: geometric superinductors, demonstrating that high impedance can be achieved beyond kinetic inductance,\r\nand Josephson junction chains, used to investigate both microwave mode properties and DC transport across the superconductor-to-insulator transition. \r\nPart I addresses geometric superinductors. Contrary to the common belief that high-impedance superconducting circuits require kinetic inductance, we demonstrate that purely geometric designs can achieve characteristic impedance exceeding the resistance quantum. By exploiting mutual coupling between adjacent turns, coil-based inductors achieve enhanced self-inductance, creating a reliable platform for qubits and resonators. Modeling, simulation, fabrication, and\r\ncharacterization confirm that these elements behave as superinductor. With low loss, high linearity, and minimal stray capacitance, these elements are reproducible, free of uncontrolled tunneling events, and capable of strong magnetic coupling. This establishes geometric superinductors as robust, single-wave-function superconducting devices suitable for hardware protected qubits and hybrid systems.\r\nPart II presents classical numerical simulations of a Quantum Phase Slip circuit to study dual Shapiro steps. The circuit consists of an ideal Quantum Phase Slip element embedded in a resistive-inductive environment with a parasitic capacitance.\r\nPart III extends the investigation of high characteristic-impedance circuit elements to one-dimensional Josephson junction chains, which act as a quantum simulator for many-body physics and the superconductor–insulator transition. Different devices are realized on both sides of the DC phase transition, showing either a supercurrent branch or Coulomb blockade at zero bias. The effect of the crossover on microwave modes, however, remains insufficiently investigated. Studying these modes provides insight into the interplay between disorder and phase-slip events. Small differences in circuit component sizes determine which side of the transition a device falls on, making these results relevant not only for fundamental understanding but also for the design of quantum devices, emphasizing the crucial role of the\r\nelectromagnetic environment in stabilizing and controlling fragile quantum states. \r\nTogether, these results illustrate how carefully engineered high characteristic-impedance elements provide a link between macroscopic circuits and the inherently uncertain quantum world, enabling experiments that probe, control, and ultimately exploit quantum fluctuations for applications in quantum information, metrology, solid state physics and beyond.\r\n\r\n","lang":"eng"}],"doi":"10.15479/AT-ISTA-20371","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","oa_version":"Published Version","supervisor":[{"orcid":"0000-0001-8112-028X","full_name":"Fink, Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink","first_name":"Johannes M"}],"type":"dissertation","publisher":"Institute of Science and Technology Austria","citation":{"short":"A. Trioni, High-Impedance Quantum Circuits for Mesoscopic Physics : Geometric Superinductors and Insulating Josephson Chains, Institute of Science and Technology Austria, 2025.","ieee":"A. Trioni, “High-impedance quantum circuits for mesoscopic physics : Geometric superinductors and insulating Josephson Chains,” Institute of Science and Technology Austria, 2025.","mla":"Trioni, Andrea. <i>High-Impedance Quantum Circuits for Mesoscopic Physics : Geometric Superinductors and Insulating Josephson Chains</i>. Institute of Science and Technology Austria, 2025, doi:<a href=\"https://doi.org/10.15479/AT-ISTA-20371\">10.15479/AT-ISTA-20371</a>.","apa":"Trioni, A. (2025). <i>High-impedance quantum circuits for mesoscopic physics : Geometric superinductors and insulating Josephson Chains</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT-ISTA-20371\">https://doi.org/10.15479/AT-ISTA-20371</a>","ista":"Trioni A. 2025. High-impedance quantum circuits for mesoscopic physics : Geometric superinductors and insulating Josephson Chains. Institute of Science and Technology Austria.","chicago":"Trioni, Andrea. “High-Impedance Quantum Circuits for Mesoscopic Physics : Geometric Superinductors and Insulating Josephson Chains.” Institute of Science and Technology Austria, 2025. <a href=\"https://doi.org/10.15479/AT-ISTA-20371\">https://doi.org/10.15479/AT-ISTA-20371</a>.","ama":"Trioni A. High-impedance quantum circuits for mesoscopic physics : Geometric superinductors and insulating Josephson Chains. 2025. doi:<a href=\"https://doi.org/10.15479/AT-ISTA-20371\">10.15479/AT-ISTA-20371</a>"},"publication_identifier":{"isbn":["978-3-99078-067-1"],"issn":["2663-337X"]},"author":[{"full_name":"Trioni, Andrea","id":"42F71B44-F248-11E8-B48F-1D18A9856A87","last_name":"Trioni","first_name":"Andrea"}],"acknowledgement":"I also gratefully acknowledge the generous support of the NOMIS Foundation Project \"Protected\r\nStates of Quantum Matter\" and the grant from the Beyond-C consortium. Their funding\r\nmade this research possible and gave me the freedom to ask ambitious questions, and try to\r\nanswer them.\r\n","corr_author":"1","degree_awarded":"PhD","month":"09"}