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View article: Comparative Analysis of Thermal Models for Test Masses in Next-Generation Gravitational Wave Interferometers
Comparative Analysis of Thermal Models for Test Masses in Next-Generation Gravitational Wave Interferometers Open
Accurate thermal modeling of Terminal Test Masses (TTMs) is crucial for optimizing the sensitivity of gravitational wave interferometers like Virgo. In fact, in such gravitational wave detectors even minimal laser power absorption can indu…
View article: Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors
Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors Open
Brownian thermal noise of thin-film coatings is a fundamental limit for high-precision experiments based on optical resonators such as gravitational-wave interferometers. Here we present the results of a research activity aiming to develop…
View article: Toward the optimization of SiO2 and TiO2-based metamaterials: Morphological, Structural, and Optical characterization
Toward the optimization of SiO2 and TiO2-based metamaterials: Morphological, Structural, and Optical characterization Open
In recent years, metamaterials have emerged as a crucial technology for designing sub-wavelength thick optical components capable of performing various optical functions. Among the others, these nanostructures could be employed to tune the…
View article: Optimizing nanostructure deposition process for optical applications
Optimizing nanostructure deposition process for optical applications Open
In many physics and engineering applications requiring exceptional precision, the presence of highly reflective coatings with low thermal noise is of utmost significance. These applications include high‐resolution spectroscopy, optical ato…
View article: Negative differential resistance in Josephson junctions coupled to a cavity
Negative differential resistance in Josephson junctions coupled to a cavity Open
Regions with negative differential resistance can arise in the IV curve of Josephson junctions and this phenomenon plays an essential role for applications, in particular for THz radiation emission. For the measurement of high frequency ra…
View article: Role of substrate and TiO<sub>2</sub> content in TiO<sub>2</sub>:Ta<sub>2</sub>O<sub>5</sub> coatings for gravitational wave detectors
Role of substrate and TiO<sub>2</sub> content in TiO<sub>2</sub>:Ta<sub>2</sub>O<sub>5</sub> coatings for gravitational wave detectors Open
Gravitational wave detectors (GWDs) are designed to detect the elusive signals produced by spacetime ripples, the GWs. The key to improving GWD sensitivity relies on the reduction of the thermal noise introduced by the mirrors. The high re…
View article: Characterization of Traveling-Wave Josephson Parametric Amplifiers at <i>T</i> = 0.3 K
Characterization of Traveling-Wave Josephson Parametric Amplifiers at <i>T</i> = 0.3 K Open
The growing interest in quantum technologies, from fundamental physics experiments to quantum computing, demands for extremely performing electronics only adding the minimum amount of noise admitted by quantum mechanics to the input signal…
View article: Modeling of Josephson Traveling Wave Parametric Amplifiers
Modeling of Josephson Traveling Wave Parametric Amplifiers Open
The recent developments in quantum technologies, as well as advanced detection experiments, have raised the need to detect extremely weak signals in the microwave frequency spectrum. To this aim, the Josephson travelling wave parametric am…
View article: Meta-Heuristics Optimization of Mirrors for Gravitational Wave Detectors: Cryogenic Case
Meta-Heuristics Optimization of Mirrors for Gravitational Wave Detectors: Cryogenic Case Open
In this paper, we explore the behavior of several optimization methods for reducing coating Brownian noise in the mirrors of gravitational wave detectors. We will refer to cryogenic operating temperatures, where the low refractive index ma…
View article: Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers
Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers Open
The advent of ultra-low noise microwave amplifiers revolutionized several\nresearch fields demanding quantum-limited technologies. Exploiting a\ntheoretical bimodal description of a linear phase-preserving amplifier, in this\ncontribution …
View article: Development of Quantum Limited Superconducting Amplifiers for Advanced Detection
Development of Quantum Limited Superconducting Amplifiers for Advanced Detection Open
Ultralow-noise microwave amplification and detection play a central role in different applications, going from fundamental physics experiments to the deployment of quantum technologies. In many applications the necessity of reading multipl…
View article: Optimal Design of Coatings for Mirrors of Gravitational Wave Detectors: Analytic Turbo Solution via Herpin Equivalent Layers
Optimal Design of Coatings for Mirrors of Gravitational Wave Detectors: Analytic Turbo Solution via Herpin Equivalent Layers Open
In this paper, an analytical solution to the problem of optimal dielectric coating design of mirrors for gravitational wave detectors is found. The technique used to solve this problem is based on Herpin’s equivalent layers, which provide …
View article: Emergence and Evolution of Crystallization in TiO2 Thin Films: A Structural and Morphological Study
Emergence and Evolution of Crystallization in TiO2 Thin Films: A Structural and Morphological Study Open
Among all transition metal oxides, titanium dioxide (TiO2) is one of the most intensively investigated materials due to its large range of applications, both in the amorphous and crystalline forms. We have produced amorphous TiO2 thin film…
View article: Voltage drop across Josephson junctions for Lévy noise detection
Voltage drop across Josephson junctions for Lévy noise detection Open
We propose to characterize L\\'evy-distributed stochastic fluctuations through\nthe measurement of the average voltage drop across a current-biased Josephson\njunction. We show that the noise induced switching process in the Josephson\nwas…
View article: Multimaterial Coatings Design via Exhaustive Search for Gravitational Wave Detectors
Multimaterial Coatings Design via Exhaustive Search for Gravitational Wave Detectors Open
In this work we analyze coatings for gravitational wave detector mirrors obtained by sequencing dielectric layers, with fixed thicknesses, made of three different materials (ternary sequences). Two materials are chosen non-dissipative, i.e…
View article: Voltage drop analysis on Josephson junctions for Lévy noise detection
Voltage drop analysis on Josephson junctions for Lévy noise detection Open
We propose to characterize Levy-distributed stochastic fluctuations through the measurement of the average voltage drop across a current-biased Josephson junction. We show that the noise induced switching process in the Josephson washboard…
View article: Nonideal quantum measurement effects on the switching-current distribution of Josephson junctions
Nonideal quantum measurement effects on the switching-current distribution of Josephson junctions Open
The quantum character of Josephson junctions is ordinarily revealed through\nthe analysis of the switching currents, i.e. the current at which a finite\nvoltage appears: A sharp rise of the voltage signals the passage (tunnel) from\na trap…
View article: Sequential nonideal measurements of quantum oscillators: Statistical characterization with and without environmental coupling
Sequential nonideal measurements of quantum oscillators: Statistical characterization with and without environmental coupling Open
A one-dimensional quantum oscillator is monitored by taking repeated position\nmeasurements. As a first con- tribution, it is shown that, under a quantum\nnondemolition measurement scheme applied to a system initially at the ground\nstate,…
View article: Switching times in Fabry-Perot measurements
Switching times in Fabry-Perot measurements Open
We show how to analyze the motion of very low dissipation suspended mirrors in a Fabry-Perot. The very precise measurements of the mirrors motion can be determined, also in the presence of a disturbing noise, by means of the sudden reflect…
View article: Material loss angles from direct measurements of broadband thermal noise
Material loss angles from direct measurements of broadband thermal noise Open
We estimate the loss angles of the materials currently used in the highly reflective test-mass coatings of interferometric detectors of gravitational waves, namely Silica, Tantala, and Ti-doped Tantala, from direct measurement of coating t…