10 results on '"Andrea Geraldi"'
Search Results
2. Enhancing nonclassical bosonic correlations in a quantum walk network through experimental control of disorder
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Alessandro Laneve, Farzam Nosrati, Andrea Geraldi, Kobra Mahdavipour, Federico Pegoraro, Mahshid Khazaei Shadfar, Rosario Lo Franco, and Paolo Mataloni
- Subjects
Physics ,QC1-999 - Abstract
The presence of disorder and inhomogeneities in quantum networks has often been unexpectedly beneficial for both quantum and classical resources. Here we experimentally realize a controllable inhomogenous quantum walk (QW) dynamics, which can be exploited to investigate the effect of coherent disorder on the quantum correlations between two indistinguishable photons. Through the imposition of suitable disorder configurations, we observe two-photon states that exhibit an enhancement in the quantum correlations between two selected modes of the network, compared to the case of an ordered QW. Different configurations of disorder can steer the system toward different realizations of such an enhancement, thus allowing spatial and temporal manipulation of quantum correlations between remote modes of QW networks.
- Published
- 2021
- Full Text
- View/download PDF
3. Transient subdiffusion via disordered quantum walks
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Andrea Geraldi, Syamsundar De, Alessandro Laneve, Sonja Barkhofen, Jan Sperling, Paolo Mataloni, and Christine Silberhorn
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Physics ,QC1-999 - Abstract
Transport phenomena play a crucial role in modern physics and applied sciences. Examples include the dissipation of energy across a large system, the distribution of quantum information in optical networks, and the timely modeling of spreading diseases. In this work we experimentally prove the feasibility of disordered quantum walks to realize a quantum simulator that is able to model general transient subdiffusive phenomena, exhibiting a sublinear spreading in space over time. Our experiment simulates such phenomena by means of a finely controlled insertion of various levels of disorder during the evolution of the walker, enabled by the unique flexibility of our setup. This allows us to explore the full range of subdiffusive behaviors, ranging from anomalous Anderson-like localization to normal diffusion for all experimentally accessible step numbers.
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- 2021
- Full Text
- View/download PDF
4. A Novel Bulk-Optics Scheme for Quantum Walk with High Phase Stability
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Andrea Geraldi, Luís Diego Bonavena, Carlo Liorni, Paolo Mataloni, and Álvaro Cuevas
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quantum optics ,quantum walks ,photonics ,Physics ,QC1-999 - Abstract
A novel bulk optics scheme for quantum walks is presented. It consists of a one-dimensional lattice built on two concatenated displaced Sagnac interferometers that make it possible to reproduce all the possible trajectories of an optical quantum walk. Because of the closed loop configuration, the interferometric structure is intrinsically stable in phase. Moreover, the lattice structure is highly configurable, as any phase component perceived by the walker is accessible, and finally, all output modes can be measured at any step of the quantum walk evolution. We report here on the experimental implementation of ordered and disordered quantum walks.
- Published
- 2019
- Full Text
- View/download PDF
5. Experimental multi-state quantum discrimination through optical networks
- Author
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Alessandro Laneve, Andrea Geraldi, Frenkli Hamiti, Paolo Mataloni, and Filippo Caruso
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Physics and Astronomy (miscellaneous) ,quantum measurements ,Materials Science (miscellaneous) ,quantum receiver ,quantum state discrimination, optical networks, quantum measurements ,optical networks ,quantum information processing ,Atomic and Molecular Physics, and Optics ,quantum state discrimination ,quantum communication ,quantum optics ,Electrical and Electronic Engineering ,optical network - Abstract
Developing strategies to effectively discriminate between different quantum states is a fundamental issue in quantum information and communication. The actual realization of generally optimal protocols in this task is often limited by the need of supplemental resources and very complex receivers. We have experimentally implemented two discrimination schemes in a minimum-error scenario based on a receiver featured by a network structure and a dynamical processing of information. The first protocol implemented in our experiment, directly inspired to a recent theoretical proposal, achieves binary optimal discrimination, while the second one provides a novel approach to multi-state quantum discrimination, relying on the dynamical features of the network-like receiver. This strategy exploits the arrival time degree of freedom as an encoding variable, achieving optimal results, without the need for supplemental systems or devices. Our results further reveal the potential of dynamical approaches to quantum state discrimination tasks, providing a possible starting point for efficient alternatives to current experimental strategies.
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- 2022
6. A Novel Bulk-Optics Scheme for Quantum Walk with High Phase Stability
- Author
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Carlo Liorni, Álvaro Cuevas, Paolo Mataloni, Luís Diego Bonavena, and Andrea Geraldi
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Quantum optics ,quantum walks ,photonics ,FOS: Physical sciences ,Crystal structure ,01 natural sciences ,010305 fluids & plasmas ,Optics ,Lattice (order) ,0103 physical sciences ,Astronomical interferometer ,Quantum walk ,quantum optics ,010306 general physics ,Physics ,Quantum Physics ,Phase stability ,business.industry ,Condensed Matter Physics ,lcsh:QC1-999 ,Electronic, Optical and Magnetic Materials ,Interferometry ,Photonics ,business ,Quantum Physics (quant-ph) ,lcsh:Physics ,Optics (physics.optics) ,Physics - Optics - Abstract
A novel bulk optics scheme for quantum walks is presented. It consists of a one-dimensional lattice built on two concatenated displaced Sagnac interferometers that make it possible to reproduce all the possible trajectories of an optical quantum walk. Because of the closed loop configuration, the interferometric structure is intrinsically stable in phase. Moreover, the lattice structure is highly configurable, as any phase component perceived by the walker is accessible, and finally, all output modes can be measured at any step of the quantum walk evolution. We report here on the experimental implementation of ordered and disordered quantum walks., This manuscript is organized in 5 sections, containing 8 pages and 7 figures
- Published
- 2019
7. Experimental realization of an innovative phase-stable bulk-optic scheme for quantum walks
- Author
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Luós Diego Bonavena, Carlo Liorni, Álvaro Cuevas, Paolo Mataloni, and Andrea Geraldi
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Physics ,Anderson localization ,Quantum walks, all-optical setup, experimental quantum walk ,Quantum mechanics ,Scheme (mathematics) ,all-optical setup ,experimental quantum walk ,Phase (waves) ,Quantum walk ,Radiation ,Realization (systems) ,Quantum walks - Abstract
We present a bulk-optics setup for discrete quantum walks, based on a novel multipass displaced Sagnac geometry. It is phase stable, reconfigurable and allows to meausure the output radiation at each step. The experimental results of both ordered and disordered one-particle evolutions are reported.
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- 2019
8. All-optical implementation of collision-based evolutions of open quantum systems
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Carlo Liorni, Antonella De Pasquale, Andrea Geraldi, Paolo Mataloni, Álvaro Cuevas, Fabio Sciarrino, Luís Diego Bonavena, Vittorio Giovannetti, Cuevas, Álvaro, Geraldi, Andrea, Liorni, Carlo, Bonavena, Luís Diego, De Pasquale, Antonella, Sciarrino, Fabio, Mataloni, Paolo, and Giovannetti, Vittorio
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0301 basic medicine ,non markovian evolution ,Photon ,single photons and quantum effects ,FOS: Physical sciences ,Markov process ,lcsh:Medicine ,Quantum entanglement ,Tracking (particle physics) ,Topology ,Article ,Open quantum systems ,03 medical and health sciences ,symbols.namesake ,0302 clinical medicine ,Astronomical interferometer ,quantum optics ,Author Correction ,lcsh:Science ,Quantum ,quantum simulation ,Backflow ,Physics ,Quantum Physics ,Multidisciplinary ,lcsh:R ,markovian evolution ,quantum theory ,entanglement ,030104 developmental biology ,Qubit ,symbols ,lcsh:Q ,Quantum Physics (quant-ph) ,Quantum optics Quantum simulation Single photons and quantum effects ,030217 neurology & neurosurgery - Abstract
We present a new optical scheme enabling the implementation of highly stable and configurable non-Markovian dynamics. Here one photon qubit can circulate in a multipass bulk geometry consisting of two concatenated Sagnac interferometers to simulate the so called collisional model, where the system interacts at discrete times with a vacuum environment. We show the optical features of our apparatus and three different implementations of it, replicating a pure Markovian scenario and two non-Markovian ones, where we quantify the information backflow by tracking the evolution of the initial entanglement between the system photon and an ancillary one., This document is organized in 5 sections, containing 10 pages and 7 figures
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- 2019
9. Efectos del alcohol en la aparición de cirrosis hepática
- Author
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Diana Carolina Solís Alcivar, Alejandro Bermúdez Garcell, Nilvia Bienvenida Serrano Gámez, Rolando Teruel Ginés, and Andrea Geraldine Castro Maquilón
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Medicine (General) ,R5-920 - Abstract
La cirrosis hepática alcohólica es un problema de salud mundial por sus elevadas tasas de morbilidad y mortalidad. Se consultaron las bases de datos de PMC (https://www.ncbi.nlm.nih.gov/pmc), SciELO (https://search.scielo.org) y Clinical Key (https://www.clinicalkey.es) con los descriptores cirrosis hepática alcohólica en inglés y español. En este trabajo se describe la etiología de la cirrosis hepática, los factores de riesgo, el metabolismo del etanol con las enzimas implicadas y la fisiopatología de daño alcohólico. Palabras clave: cirrosis hepática alcohólica, etanol, hígado, metabolismo, enzimas.
- Published
- 2020
10. Papel de las citoquinas en la fisiopatología de la artritis reumatoide
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Gisela Eduarda Feria Díaz, Carlos Alberto Leyva Proenza, Walquiris Concepción Parra, Andrea Geraldine Castro Maquilón, and Ivonne Silvana Larrea Meza
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Medicine (General) ,R5-920 - Abstract
La artritis reumatoide es una enfermedad sistémica crónica de etiología multifactorial que afecta las articulaciones. Su fisiopatología no es bien conocida, pero indica que existe un papel relevante de las citoquinas como moléculas que interrelacionan los trastornos del sistema inmune y el neuroendocrino con factores ambientales. En esta revisión se describe el papel de las citoquinas proinflamatorias en la fisiopatología de la artritis reumatoide y la aplicación práctica de estos conocimientos en el diseño de nuevos medicamentos para el tratamiento de esta enfermedad. Para ello se revisaron las bases de datos MedLine, MedicalKey y SciELO con los descriptores citoquinas y artritis reumatoide en español e inglés. Se filtraron principalmente para los artículos citables publicados en los últimos 5 años. También se revisaron las revistas biomédicas cubanas. Palabras clave: artritis reumatoide, citoquinas, fisiopatología, autoinmunidad, inflamación.
- Published
- 2020
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