A5080054926- Quantum Information and Cryptography
- Advanced Thermodynamics and Statistical Mechanics
- stochastic dynamics and bifurcation
- Quantum many-body systems
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Nonlinear Dynamics and Pattern Formation
- Mechanical and Optical Resonators
- Nonlinear Photonic Systems
- Neural dynamics and brain function
- Topological Materials and Phenomena
- Advanced Memory and Neural Computing
- Spectroscopy and Quantum Chemical Studies
- Quantum Mechanics and Non-Hermitian Physics
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Stock Market Forecasting Methods
- Theoretical and Computational Physics
- Financial Markets and Investment Strategies
- Corporate Finance and Governance
- Physics of Superconductivity and Magnetism
- Surface Chemistry and Catalysis
University of Palermo
2016-2025
N. I. Lobachevsky State University of Nizhny Novgorod
2016-2022
National Interuniversity Consortium for the Physical Sciences of Matter
2015-2022
Centre for Quantum Technologies
2005-2016
National University of Singapore
2005-2016
Austrian Academy of Sciences
2006-2008
University of Cambridge
2004-2006
Universität Innsbruck
2006
Google (United States)
2006
Institute for Quantum Optics and Quantum Information Innsbruck
2006
Abstract We propose a stochastic model for memristive system by generalizing known approaches and experimental results. validate our theoretical experiments carried out on device based multilayer structure. In the framework of proposed we obtain exact analytic expressions stationary nonstationary solutions. analyze equilibrium non-equilibrium steady-state distributions internal state variable study influence fluctuations resistive switching, including relaxation time to steady-state. The...
We calculate the geometric phase associated with evolution of a system subjected to decoherence through quantum-jump approach. The method is general and can be applied many different physical systems. As examples, two main sources are considered: dephasing spontaneous decay. show that completely insensitive former, i.e., it independent number jumps determined by operator.
A relation between geometric phases and criticality of spin chains is established. As a result, we show how can be exploited as tool to detect regions without having undergo quantum phase transition. We analytically evaluate the that corresponds ground excited states anisotropic XY model in presence transverse magnetic field when direction anisotropy adiabatically rotated. It demonstrated resulting resilient against main sources errors. physical realization with ultracold atoms optical...
In this article we derive a measure of quantumness in quantum multi-parameter estimation problems. We can show that the ratio between mean Uhlmann Curvature and Fisher Information provides figure merit which estimates amount incompatibility arising from nature underlying physical system. This accounts for discrepancy attainable precision simultaneous multiple parameters predicted by Cram\'er-Rao bound. As testbed concept, consider many-body system thermal equilibrium, explore compatibility...
A novel approach based on the Uhlmann curvature is introduced for investigation of non-equilibrium steady-state quantum phase transitions (NESS-QPTs). Equilibrium fall invariably into two markedly non-overlapping categories: classical and transitions. NESS-QPTs offer a unique arena where such distinction fades off. We propose method to reveal quantitatively assess character critical phenomena. apply this tool paradigmatic class lattice fermion systems with local reservoirs, characterised by...
We numerically investigate the generation of solitons in current-biased long Josephson junctions relation to superconducting lifetime and voltage drop across device. The dynamics junction is modelled with a sine-Gordon equation driven by an oscillating field subject external non-Gaussian noise. A wide range $\alpha$-stable L\'evy distributions considered as noise source, varying stability index $\alpha$ asymmetry parameter $\beta$. In longer than critical length, mean switching time (MST)...
We investigate the superconducting lifetime of a long overdamped current-biased Josephson junction, in presence telegraph noise sources. The analysis is performed by randomly choosing initial condition for source. However, order to how value dichotomous affects phase dynamics, we extend our using two different fixed values source random fluctuations. In study, dynamics junction analyzed as function signal intensity, parameters system and external driving currents. find that mean...
Nonlinear relaxation phenomena in three different systems of condensed matter are investigated. (i) First, the phase dynamics Josephson junctions is analyzed. Specifically, a superconductor-graphene-superconductor (SGS) system exhibits quantum metastable states, and average escape time from these states presence Gaussian correlated fluctuations calculated, accounting for variations noise source intensity bias frequency. Moreover, transient long-overlap junction (JJ) subject to thermal...
The low-frequency noise in a nanometer-sized virtual memristor consisting of contact conductive atomic force microscope (CAFM) probe to an yttria stabilized zirconia (YSZ) thin film deposited on substrate is investigated. YSZ promising material for the application since it featured by high oxygen ion mobility, and vacancy concentration can be controlled varying molar fraction stabilizing yttrium oxide. Due low diameter CAFM (∼10 nm), we are able measure electric current flowing through...
Resistive switching (RS) is studied in a memristor based on ZrO2(Y)/Ta2O5 stack under white Gaussian noise voltage signal. We have found that the switches between low resistance state and high random telegraphic signal (RTS) mode. The effective potential profile of shows from two to three local minima depends input parameters operation. These observations indicate multiplicative character dynamical behavior memristor, perceived by system its electrical properties are influenced detected...
We investigate how the combined effects of strong Ohmic dissipation and monochromatic driving affect stability a quantum system with metastable state. find that, by increasing coupling environment, escape time makes transition from regime in which it is substantially controlled driving, displaying resonant peaks dips, to frequency-independent peak followed steep falloff. The state has nonmonotonic behavior as function thermal-bath coupling, temperature, frequency driving. noise-enhanced...
We identify a class of dressed atom-photon states forming at the same energy atom any coupling strength. As hallmark, their photonic component is an eigenstate bare bath with vacancy in place atom. The picture accommodates waveguide-QED phenomena where atoms behave as perfect mirrors, connecting particular bound (BSs) continuum geometrically confined modes. When applied to lattices, framework establishes one-to-one correspondence between topologically robust and BSs seeded by vacancy. This...
Abstract As light can mediate interactions between atoms in a photonic environment, engineering it for endowing the photon-mediated Hamiltonian with desired features, like robustness against disorder, is crucial quantum research. We provide general theorems on topology of terms both Hermitian and non-Hermitian topological invariants, unveiling phenomena preservation reversal, revealing system-bath correspondence. Depending Hermiticity environment parity spatial dimension, atomic invariants...
Photon-mediated interaction between quantum emitters in engineered photonic baths is an emerging area of optics. At the same time, non-Hermitian (NH) physics currently thriving, spurred by exciting possibility to access new systems ruled non-trivial NH Hamiltonians—in particular, lattices—which can challenge longstanding tenets such as Bloch theory bands. Here, we combine these two fields and study exotic mediated modes a lossy lattice described Hamiltonian. We show paradigmatic case that...
We calculate the geometric phase of a spin-1/2 system driven by one and two mode quantum fields subject to decoherence. Using jump approach, we show that corrections in no-jump trajectory are different when considering adiabatic nonadiabatic evolutions. discuss implications our results from both fundamental as well computational perspectives.
We calculate the Berry phase of a spin-1/2 particle in magnetic field considering quantum nature field. The reduces to standard semiclassical limit and eigenstate acquires vacuum. also show how generate vacuum induced two quantized modes which has an interesting physical interpretation.
Simulation models of economic, financial and business risk factors are widely used to assess risks support decision-making. Extensive literature on scenario generation methods aims at describing some underlying stochastic processes with the least number scenarios overcome 'curse dimensionality'. There is, however, an important requirement that is usually overlooked when one departs from application domain security pricing: no-arbitrage condition. We formulate a moment matching model generate...