Article
Physics, Multidisciplinary
Salvatore Lorenzo, Benedetto Militello, Anna Napoli, Roberta Zambrini, G. Massimo Palma
Summary: We study the emergence of synchronisation in a chiral network of harmonic oscillators. By cascaded coupling and locally incoherently pumped oscillators, a feedback-less dissipative interaction between the oscillators is achieved. The results show that the onset of synchronisation depends strongly on the network topology, with synchronised communities emerging in complex networks.
NEW JOURNAL OF PHYSICS
(2022)
Review
Physics, Multidisciplinary
Francesco Ciccarello, Salvatore Lorenzo, Vittorio Giovannetti, G. Massimo Palma
Summary: This article presents an extensive introduction to quantum collision models (CMs), which are microscopic system-bath models used for investigating dynamics of open quantum systems. The article discusses the definition and general properties of CMs, their application in deriving master equations, their connection with quantum trajectories, and their use in non-equilibrium quantum thermodynamics, among other topics. The state of the art in each research area related to CMs is reviewed. The article also includes complementary appendices that review standard concepts and tools of open quantum systems, making the material accessible even to readers with a basic background in quantum mechanics.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2022)
Article
Optics
Federico Roccati, Salvatore Lorenzo, Giuseppe Calajo, G. Massimo Palma, Angelo Carollo, Francesco Ciccarello
Summary: Photon-mediated interaction between quantum emitters is an emerging field in quantum optics. Non-Hermitian physics, particularly in photonic lattices, challenges conventional theories and allows access to new physics. The study reveals that structured losses in the field can lead to exotic emission properties. Photons can mediate dissipative, fully non-reciprocal interactions between emitters, with the range depending on the loss rate.
Article
Multidisciplinary Sciences
Federico Roccati, Benedetto Militello, Emilio Fiordilino, Rosario Iaria, Luciano Burderi, Tiziana Di Salvo, Francesco Ciccarello
Summary: This study demonstrates the possibility of classical-channel models of gravity to establish quantum discord, despite the absence of entanglement. Significant amounts of discord are generated in the KTM model and its dissipative extension, starting from an uncorrelated state.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Marco Scigliuzzo, Giuseppe Calajo, Francesco Ciccarello, Daniel Perez Lozano, Andreas Bengtsson, Pasquale Scarlino, Andreas Wallraff, Darrick Chang, Per Delsing, Simone Gasparinetti
Summary: The article introduces a novel microwave architecture consisting of compact superconducting resonators with embedded tunable-frequency artificial atoms, which enables the study of atom-field interaction, implementation of quantum simulation, and photon transport experiments.
Article
Physics, Multidisciplinary
Federico Roccati, Archak Purkayastha, G. Massimo Palma, Francesco Ciccarello
Summary: We investigate the dynamics of correlations in a dissipative gain-loss system. By using a setup with two coupled oscillators, one subject to local gain, we can implement parity-time (PT) symmetry in a more realistic way. We find that quantum correlations are reduced while total correlations are enhanced. Furthermore, we observe different behaviors across an exceptional point (EP) outside the PT symmetric regime, indicating the relevance of PT symmetry in the long-time dynamics.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Quantum Science & Technology
Gabriele Lo Monaco, Luca Innocenti, Dario Cilluffo, Dario A. Chisholm, Salvatore Lorenzo, G. Massimo Palma
Summary: Quantum information scrambling (QIS), which is the local non-retrievability of information evolved through dynamic processes, is often quantified using entropic quantities such as the tripartite information. However, this approach has some issues due to its reliance on quantum mutual informations that do not accurately quantify correlations retrievable via measurements, as well as the specific methodology used to compute the tripartite information. By using accessible mutual informations and defining corresponding 'accessible tripartite informations', these issues can be overcome. Our findings lay the groundwork for a deeper understanding of QIS and open up new avenues for further research.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
L. Innocenti, S. Lorenzo, I. Palmisano, A. Ferraro, M. Paternostro, G. M. Palma
Summary: Quantum machine learning applies machine learning concepts and techniques to quantum devices. This paper presents a framework to model quantum extreme learning machines (QELMs), demonstrating that they can be described concisely through single effective measurements and characterizing the information retrievable using such protocols. Understanding the capabilities and limitations of QELMs will enable their full deployment in system identification, device performance optimization, and state or process reconstruction.
COMMUNICATIONS PHYSICS
(2023)
Article
Quantum Science & Technology
Dario A. Chisholm, Luca Innocenti, G. Massimo Palma
Summary: This paper points out that redundancy and consensus are different in the context of quantum objectivity, quantifying different features of the quantum-to-classical transition. The two main frameworks used to measure quantum objectivity, spectrum broadcast structure and quantum Darwinism, are best suited to quantify redundancy and consensus, respectively. By analyzing explicit examples, the paper highlights the potentially stark difference between the degrees of redundancy and consensus, causing a break in the hierarchical relations between spectrum broadcast structure and quantum Darwinism. The framework provided in this paper offers a new perspective to interpret known and future results in the context of quantum objectivity, paving the way for a deeper understanding of the emergence of classicality from the quantum realm.
Article
Mathematics, Applied
Francesco Ciccarello
Summary: This paper discusses the formal mapping between the open dynamics of periodic weak collisions and stochastic strong collisions in quantum collision models. The author constructs an associated periodic model to represent the non-Markovian behavior of the stochastic model and introduces an ancilla state to represent the correlations between the two.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2022)
Article
Mathematics, Applied
Federico Roccati, G. Massimo Palma, Francesco Ciccarello, Fabio Bagarello
Summary: This article provides a brief review of the GKSL master equation and non-Hermitian Hamiltonians, highlighting their relationship and illustrating different ways to connect the latter to the former for describing the full density matrix.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2022)
Article
Physics, Fluids & Plasmas
Vahid Shaghaghi, G. Massimo Palma, Giuliano Benenti
Summary: This study examines the statistical distribution of ergotropy and efficiency in a single-qubit battery and a single-qubit Otto engine fueled by random collisions. The interactions between the qubit and two reservoirs are described using a collision model of open system dynamics, revealing fluctuations in ergotropy, heat, and work that decrease with the size of the qudits in the hot reservoir. Although the mean macroscopic efficiency of the Otto engine remains the same, the distribution of efficiencies does not support finite moments, resulting in a discrepancy between the mean efficiency and the macroscopic efficiency.
