Chatterjee, Isita (2026) Exploiting flux tunability in Josephson Traveling Wave Parametric Amplifiers for squeezing generation. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Exploiting flux tunability in Josephson Traveling Wave Parametric Amplifiers for squeezing generation |
| Autori: | Autore Email Chatterjee, Isita isita.chatterjee@unina.it |
| Data: | 10 Febbraio 2026 |
| Numero di pagine: | 135 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Fisica |
| Dottorato: | Quantum Technologies (Tecnologie Quantistiche) |
| Ciclo di dottorato: | 38 |
| Coordinatore del Corso di dottorato: | nome email Tafuri, Francesco francesco.tafuri@unina.it |
| Tutor: | nome email Esposito, Martina [non definito] |
| Data: | 10 Febbraio 2026 |
| Numero di pagine: | 135 |
| Parole chiave: | Superconducting Parametric Amplifiers, Entanglement, Squeezing |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/03 - Fisica della materia |
| Informazioni aggiuntive: | I belong to the PhD Program in QUANTUM TECHNOLOGIES, 38th Cycle |
| Depositato il: | 31 Mar 2026 14:46 |
| Ultima modifica: | 12 Ago 2026 05:37 |
| URI: | https://www.fedoa.unina.it/id/eprint/16230 |
Abstract
Josephson Traveling-Wave Parametric Amplifiers (JTWPAs) are superconducting amplifiers that exploit the nonlinear inductance of Josephson junctions to enable parametric interactions through wave-mixing processes. In the microwave regime, JTWPAs have emerged as a leading platform for achieving broadband amplification with added noise approaching the quantum limit, making them essential components for applications such as high-fidelity readout of solid-state qubits, quantum sensing, and quantum-enhanced detection. Beyond amplification, JTWPAs have recently been exploited also as a versatile platform for the generation of nonclassical microwave states, such as squeezed states. Such states constitute key quantum resources for precision metrology, enhanced qubit readout, quantum communication, and fundamental physics experiments such as searches for dark matter. In this thesis, I focus on experimentally investigating the generation of squeezed states in a JTWPA device based on Superconducting Nonlinear Asymmetric Inductive Elements (SNAILs). The intrinsic flux tunability of the adopted SNAIL JTWPA device enables control over its nonlinear response, allowing access to different parametric interaction regimes. I exploited this tunability to study the impact of magnetic flux bias on squeezing generation. The main result of this PhD project is the first experimental demonstration of three-wave mixing squeezing generation in an SNAIL TWPA with alternated flux polarity. The outcomes of this PhD thesis provide insight into flux-controlled squeezing generation with JTWPAs, contributing to possibly extending the range of applications of traveling wave parametric devices in the framework of microwave photonics.
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