Filippo Ghiglieno - Academia.edu (original) (raw)

Papers by Filippo Ghiglieno

IntechOpen eBooks, May 27, 2024

This book chapter explores the transition from classical to quantum computing, emphasizing the ca... more This book chapter explores the transition from classical to quantum computing, emphasizing the capabilities and challenges associated with quantum bits (qubits). Unlike classical computing, where the information is represented as binary digits, known as bits, quantum bits, or qubits, although they share similarities with classical bits, such as 0 and 1 states, they operate in superposition, simultaneously encompassing both 0 and 1 states. This unique property allows quantum computers to perform certain computations, traditionally done sequentially on classical computers, more efficiently, in a single operation with a qubit. Through comparative analysis, we investigate the feasibility and costs of integrating quantum computing into daily applications, examining the potential for personal quantum computing devices. Our findings highlight significant advancements in computational speed of routine mathematical operations, although not yet economically viable or competitive in the current market. Future directions question the market readiness for quantum computing, suggesting a pivotal shift towards cloud-based quantum computing resources.

Journal of Physics D, Sep 9, 2010

The internal interfaces of multilayer Al x Ga 1-x As/AlAs nonlinear optical waveguides are invest... more The internal interfaces of multilayer Al x Ga 1-x As/AlAs nonlinear optical waveguides are investigated by high-angle annular-dark-field and energy-filtered scanning transmission electron microscopy, before and after partial wet oxidation of AlAs layers. Via a simple phenomenological model, the corresponding roughness parameters allow predicting the scattering-induced waveguide optical losses, which are in reasonable agreement with the experimental value of 0.5 cm-1. We also find that Al x Ga 1-x As layers adjacent to oxidized AlAs tend to be oxidized through the interfaces, even for low Al fraction, with typical oxidation depths of 9 nm for x=0.7 and 2 nm for x=0.

Sustainability, Apr 22, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

These data are the first prototype in Brazil of a system for monitoring the quality of water supp... more These data are the first prototype in Brazil of a system for monitoring the quality of water supply in real time, consisting of 6 low-cost electronic sensors plotted in embedded systems. This prototype was created through the partnership USP / UFSCar / IEE and is located at the Laboratory of Optics and Photonics (OLAF - UFSCar). This file contains measurements taken on 4/17/2021 and 4/24/2021 for approximately 4 hours each day, and presents the variation of the parameters according to the variation of the system flow.

Journal of Environmental Management, Dec 1, 2022

Social Science Research Network, 2022

The main goal of this project is to findalow costIoT solution for real-time monitoring of water q... more The main goal of this project is to findalow costIoT solution for real-time monitoring of water quality. With the support of a sensors network, we should be able to collect inorganic parameters in water for both domestic and industrial applications.For the first time, this tool can allow to monitoring and control the water chemical and physical data along the mains water supply and distribution.The projectrelies on support of development companies such as FAPESP and with collaboration of the International Institute of Ecology in partnership with Matsu-Aquatech and the Innovation Agency of UFSCar.

Working now in the nanotechnological world, the as small as possible dimensions both of the modul... more Working now in the nanotechnological world, the as small as possible dimensions both of the modules and of the devices are required in telecommunication (TLC) context. In fact small and compact devices allow whether to reduce the module dimension or to gain more space for the electronic control circuits on the board maintaining the same module dimensions. Then the modules and the inside devices must satisfy the following market requests: high operating temperature, low power consumption, hot pluggable, low cost, high performances, good reliability (<10 years). In this context the material science and chemical engineering offer the right tool both for tailoring the properties of the well known materials used in the devices for the TLC applications and for discovering, designing, studying new unknown materials; the target is naturally to improve the performances of the devices working often in the network in a wide stressing range of the operative conditions, reducing the cost and guaranteeing high reliability. The aim of this work is to report on theoretical and experimental results of a new III-V material, based on quantum dot technology.

Applied Physics Letters, Apr 27, 2009

We report the direct proof of parametric amplification in a semiconductor waveguide. Thanks to lo... more We report the direct proof of parametric amplification in a semiconductor waveguide. Thanks to low propagation losses and high nonlinear efficiency, we amplified an input signal at 2 μm in a selectively oxidized GaAs/AlAs multilayer waveguide through the down conversion of a pump at 1 μm. The 4.5% single-pass gain measured for a 30 mW cw pump is compatible with parametric oscillation, provided that distributed and concentrated waveguide losses are further reduced.

Brazilian Journal of Development, Mar 2, 2022

This paper aimed to investigate, both by simulations and experiments, the report from the passeng... more This paper aimed to investigate, both by simulations and experiments, the report from the passengers that use the bus stop located in Praça dos Voluntários, next to the Municipal Market in São Carlos, in the countryside of São Paulo state, Brazil. Since the installation, users have claimed an excessive increase in the temperature in the region below the covering. We started characterizing in the laboratory the optical properties for the polymeric material used for the structure, and we simulated refraction and reflection effect at the covering surface. From the experimental point of view, we designed, fabricated and tested a low-cost monitoring station with the purpose of collecting in-situ data to correlate our model with the measurements. Once installed the station, the measurements showed a good agreement with the theoretical optical model developed for the architectural structure. Moreover, we showed that also if the material is probably the main responsible for influencing excessive heat and temperature increase, the shape and geometry amplify the studied optical phenomena. The reflection and the refraction at the covering add up getting worse the thermal situation and compromising the role of the roofing at the bus stops: to protect the passengers from the sunlight and to reduce the heat detected above the architectural structure. Keywords: real time monitoring, low cost environmental monitoring stations, in situ prescreening, new technologies for decision making, climate change, optical modelling. RESUMO Este documento visava investigar, tanto por simulações como por experiências, o relatório dos passageiros que utilizam a paragem de autocarro localizada na Praça dos Voluntários, junto ao Mercado Municipal de São Carlos, no interior do estado de São Paulo, Brasil. Desde a instalação, os utilizadores têm reclamado um aumento excessivo da temperatura na região abaixo da cobertura. Começámos a caracterizar em laboratório as propriedades ópticas do material polimérico utilizado para a estrutura, e simulámos o efeito de refracção e reflexão na superfície

InTech eBooks, Jan 16, 2013

$Research paper thumbnail of High-Performance Directly Modulated 1.3-$\mu$m Undoped InAs–InGaAs Quantum-Dot Lasers$

IEEE Photonics Technology Letters, Feb 1, 2007

In this letter, we report on experimental results of directly modulated single-transverse mode 1.... more In this letter, we report on experimental results of directly modulated single-transverse mode 1.3-mum InAs-InGaAs quantum-dot (QD) lasers in a wide temperature range. A 3.125-Gb/s data modulation over temperature with an extinction ratio up to 10 dB is reported. Moreover, 10-Gb/s eye patterns at 15 degC and 50 degC and 5-Gb/s modulation in the whole explored temperature range (15 degC-85 degC) are demonstrated. These results were obtained by exploiting heterostructures containing six layers of high modal gain InAs QDs grown without incorporation of p-doping in the active region or tunnelling injection structure implementation. QD lasers exhibited a saturation modal gain as high as 36.3 cm-1, ground state lasing from short cavities down to 400-mum length and a characteristic temperature of about 110 K in a large temperature range between 15 degC and 85 degC

ABSTRACT We report on Type-I CW SHG in AlGaAs/AlOx waveguides, with pump wavelength around 1.55 μ... more ABSTRACT We report on Type-I CW SHG in AlGaAs/AlOx waveguides, with pump wavelength around 1.55 μm and 2.8% W-1 conversion efficiency. This result is encouraging toward integrated spontaneous parametric downconversion in the telecom range.

Proceedings of SPIE, Apr 30, 2010

Continuously tunable sources with room-temperature operation are required in the mid-infrared reg... more Continuously tunable sources with room-temperature operation are required in the mid-infrared region for applications such as spectroscopy or pollutants monitoring. In this spectral range, optical parametric oscillators (OPOs) are more versatile than laser diodes. Guided-wave OPOs constitute a promising perspective, thanks to higher conversion efficiency provided by the confinement of the interacting waves. While LiNbO3 has been the crystal of

Royal Society Open Science, Sep 1, 2016

The hydrogen conversion patterns on non-magnetic solids sensitively depend upon the degree of sin... more The hydrogen conversion patterns on non-magnetic solids sensitively depend upon the degree of singlet/triplet mixing in the intermediates of the catalytic reaction. Three main 'symmetry-breaking' interactions are brought together. In a typical channel, the electron spin-orbit (SO) couplings introduce some magnetic excitations in the non-magnetic solid ground state. The electron spin is exchanged with a molecular one by the electric molecule-solid electron repulsion, mixing the bonding and antibonding states and affecting the molecule rotation. Finally, the magnetic hyperfine contact transfers the electron spin angular momentum to the nuclei. Two families of channels are considered and a simple criterion based on the SO coupling strength is proposed to select the most efficient one. The denoted 'electronic' conversion path involves an emission of excitons that propagate and disintegrate in the bulk. In the other denoted 'nuclear', the excited electron states are transients of a loop, and the electron system returns to its fundamental ground state. The described model enlarges previous studies by extending the electron basis to chargetransfer states and 'continui' of band states, and focuses on the broadening of the antibonding molecular excited state by the solid conduction band that provides efficient tunnelling paths for the hydrogen conversion. After working out the general conversion algebra, the conversion rates of hydrogen on insulating and semiconductor solids are related to a few molecule-solid parameters (gap width, ionization and affinity potentials) and compared with experimental measures.

European Physical Journal B, Oct 1, 2014

ABSTRACT Models are provided and discussed to interpret new experiments on the ortho-para convers... more ABSTRACT Models are provided and discussed to interpret new experiments on the ortho-para conversion of hydrogen “physisorbed” on dielectric and diamagnetic surfaces. Electro-static and dynamical molecule- surface interactions complemented by hyperfine contacts are shown to be generally more effective than the magnetic ones. Coulomb repulsion induces exchanges of molecular and surface electrons and excites triplet spin states which are effective in the angular momenta transfers to the catalyst. The conversion time is obtained as the square of a ratio of two energies: the exchange and excitation ones. The main channel is found composed of triplet excitations of the order of the eV, induced by molecule-surface exchanges of about a hundred of meV. It explains the zinc and oxygen rates of about one minute observed on the MOF samples as well as the about ten times slower ones on the ASW. The same mechanism is also shown to occur in the transient regime, but faster. Finally it explains also the conversion of a few hours observed for interstitial hydrogen in silicium by transitions to the conduction band induced by about 10 meV electron exchanges. The molecule-surface orbital geometries of the MOF and ASW configurations are displayed and the quantum path when unfolded exhibits the successive broken symmetries.

Journal of Water Resources Planning and Management, Nov 1, 2022

Research, Society and Development, Jan 13, 2023

Proposta de um framework para melhorar a tomada de decisão multicritério relacionada a epidemias ... more Proposta de um framework para melhorar a tomada de decisão multicritério relacionada a epidemias usando dados espaciais heterogêneos e algoritmos evolutivos Propuesta de un framework para mejorar la toma de decisiones multicriterio relacionadas con epidemias utilizando datos espaciales heterogéneos y algoritmos evolutivos