A5041932295- Quantum Information and Cryptography
- Neural Networks and Reservoir Computing
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- Quantum many-body systems
- Mechanical and Optical Resonators
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Memory and Neural Computing
- Spectroscopy and Quantum Chemical Studies
- Nonlinear Dynamics and Pattern Formation
- Neural Networks and Applications
- Optical Network Technologies
- Neural dynamics and brain function
- Cold Atom Physics and Bose-Einstein Condensates
- stochastic dynamics and bifurcation
- Strong Light-Matter Interactions
- Topological Materials and Phenomena
- Photonic and Optical Devices
- Machine Learning and ELM
- Nonlinear Photonic Systems
- Quantum chaos and dynamical systems
- Semiconductor Lasers and Optical Devices
- Quantum, superfluid, helium dynamics
Institute for Cross-Disciplinary Physics and Complex Systems
2016-2025
Consejo Superior de Investigaciones Científicas
2010-2024
Universitat de les Illes Balears
2011-2024
Centre National de la Recherche Scientifique
2020
Institut UTINAM
2020
Université Bourgogne Franche-Comté
2020
Istituto Nazionale di Ricerca Metrologica
2013-2016
University College Cork
2012-2013
Saarland University
2013
Okinawa Institute of Science and Technology Graduate University
2012
Quantum machine learning represents a promising avenue for data processing, also purposes of sequential temporal analysis, as recently proposed in quantum reservoir computing (QRC). The possibility to operate on several platforms and noise intermediate-scale devices makes QRC timely topic. A challenge that has not been addressed yet, however, is how efficiently include measurement realistic protocols, while retaining the memory needed time series processing preserving advantage offered by...
We consider the phenomenon of mutual synchronization in a fundamental quantum system two detuned harmonic oscillators dissipating into environment. identify conditions leading to this spontaneous showing that ability synchronize is related existence disparate decay rates and accompanied by robust discord information between oscillators, preventing leak from system.
In contrast with entanglement, as measured by concurrence, in general, quantum discord does not possess the property of monogamy; that is, there is no tradeoff between shared a pair subsystems and both them can share third party. Here, we show that, far monogamy considered, pure states equivalent to entanglement formation. This result allows one analytically prove none three-qubit belonging subclass $W$ monogamous. A suitable physical interpretation meaning correlation information quantifier...
Generalizing the quantifiers used to classify correlations in bipartite systems, we define genuine total, quantum, and classical multipartite systems. The measure give is based on use of relative entropy quantify "distance" between two density matrices. Moreover, show that, for pure states three qubits, both quantum obey a ladder ordering law fixed by two-body mutual informations, or, equivalently, one-qubit entropies.
We introduce the multipartite collision model, defined in terms of elementary interactions between subsystems and ancillas, show that it can simulate Markovian dynamics any open quantum system. develop a method to estimate an analytical error bound for repeated we use prove our scheme displays optimal scaling. Finally, provide simple decomposition model into gates, is efficiently simulable on computer according dissipative Church-Turing theorem, i.e., requires polynomial number resources.
Closed quantum systems exhibit different dynamical regimes, like many-body localization or thermalization, which determine the mechanisms of spread and processing information. Here we address impact these phases in reservoir computing, an unconventional computing paradigm recently extended into regime that exploits to solve nonlinear temporal tasks. We establish thermal phase is naturally adapted requirements report increased performance at thermalization transition for studied Uncovering...
Quantum Reservoir Computing (QRC) exploits the information processing capabilities of quantum systems to solve non-trivial temporal tasks, improving over their classical counterparts. Recent progress has shown potential QRC exploiting enlarged Hilbert space, but real-time and achievement a advantage with efficient use resources are prominent challenges towards viable experimental realizations. In this work, we propose photonic platform suitable for based on physical ensemble reservoirs in...
Dissipation induced by interactions with an external environment typically hinders the performance of quantum computation, but in some cases can be turned out as a useful resource. We show potential enhancement dissipation field reservoir computing introducing tunable local losses spin network models. Our approach based on continuous is able not only to reproduce dynamics previous proposals computing, discontinuous erasing maps also enhance their performance. Control damping rates shown...
This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementation philosophies reported in field. It emphasizes critical role cross-disciplinary collaboration this rapidly evolving
We discuss the emergence of spontaneous synchronization for an open spin-pair system interacting only via a common environment. Under suitable conditions, and even in presence detuning between natural precession frequencies two spins, they are shown to reach long-lasting transient behavior where oscillate phase. explore connection such establishment robust quantum correlations analyzing differences dissipative dephasing effects.
We study the relative strength of classical and quantum correlations, as measured by discord, for two-qubit states. Quantum correlations appear only in presence while reverse is not always true. identify family states that maximize discord a given value show largest attainable mixed greater than pure The difference between entanglement emphasized remarkable fact these do are, some cases, even separable. Finally, random generation density matrices uniformly distributed over whole Hilbert...
Synchronization is one of the paradigmatic phenomena in study complex systems. It has been explored theoretically and experimentally mostly to understand natural phenomena, but also view technological applications. Although several mechanisms conditions for synchronous behavior spatially extended systems networks have identified, emergence this phenomenon largely unexplored quantum until very recently. Here we discuss synchronization different harmonic oscillators relaxing towards a...
The distance between a quantum state and its closest not having certain property has been used to quantify the amount of correlations corresponding that property. This approach allows unified view various kinds present in system. In particular, using relative entropy as measure, total can be meaningfully separated classical part thanks an additive relation involving only distances states. Here, we investigate measure square norm, already define so-called geometric discord. We thus consider...
Two different models are presented that allow for efficiently performing routing of a quantum state. Both cases involve an $XX$ spin chain working as data bus and additional spins play the role sender receivers, one which is selected to be target state transmission protocol via coherent coupling mechanism making use local and/or global magnetic fields. Quantum achieved in first considered by weakly receiver bus. On other hand, second model, fields acting on located between us perform...
We study the relationship between collective phenomena of super- and subradiance spontaneous synchronization quantum systems. To this aim we revisit case two detuned qubits interacting through a pure dissipative bosonic environment, which contains minimal ingredients for our analysis. By using Liouville formalism, are able to find analytically ultimate connection these phenomena. that dynamical is due presence longstanding coherence ground state system subradiant state. finally show that,...
The interaction of a quantum system, which is not accessible by direct measurement, with an external probe can be exploited to infer specific features the system itself. We introduce probing scheme based on emergence spontaneous synchronization between out-of-equilibrium qubit, in contact environment, and qubit. Tuning frequency leads transition phase antiphase. sharp these two regimes locally monitoring dynamics alone allows one reconstruct shape spectral density environment.
Abstract Fast and robust quantum state transfer (QST) is a major requirement in control scalable information processing. Topological protection has emerged as promising route for the realization of QST against sizable imperfections network. Here, scheme presented topologically protected edge states dimeric Su–Schrieffer–Heeger spin chain assisted by Landau–Zener tunneling. As compared to topological protocols based on Rabi flopping proposed recent works, method more advantageous terms...
Abstract Open systems of coupled qubits are ubiquitous in quantum physics. Finding a suitable master equation to describe their dynamics is therefore crucial task that must be addressed with utmost attention. In the recent past, many efforts have been made toward possibility employing local equations, which compute interaction environment neglecting direct coupling between qubits, and for this reason may easier solve. Here, we provide detailed derivation Markovian two interacting common...
Synchronization phenomena have been recently reported in the quantum realm at atomic level due to collective dissipation. In this work we propose a dimer lattice of trapped atoms realizing dissipative spin model where synchronization occurs instead presence local Atom is enabled by inhomogeneity staggered losses and favored an increase spins detuning. A comprehensive approach based on different measures considered literature allows us identify main features regimes.
The common use in literature of orthogonal measurements obtaining quantum discord for two-qubit states is discussed and compared with more general measurements. We prove the optimality rank 2 states. While 3 4 mixed they are not optimal, we present strong numerical evidence showing that give correct up to minimal corrections. Based on connection, through purification an ancilla, between entanglement formation (EoF), a tight upper bound EoF $2\otimes N$ state 2, given by optimal decomposition...
The role played by quantum discord in mixed-state computation is widely debated since, spite of evidence its importance creating advantages, even the absence entanglement, there are not direct proofs necessity these computational tasks. Recently presence was shown to be necessary and sufficient for remote state preparation a broad class channels [B. Daki\'c et al., Nat. Phys. 8, 666 (2012)]. Here, we show that this property universal. There states whose cannot considered as resource, since...
Abstract We explore the possibility of enhancing performance small thermal machines by presence common noise sources. In particular, we study a prototypical model for an autonomous quantum refrigerator comprised three qubits coupled to reservoirs at different temperatures. Our results show that engineering coupling act as environments lead relevant improvements in performance. The enhancements arrive almost double cooling power original fridge without compromising its efficiency. greater are...
We address the structure of Liouvillian superoperator for a broad class bosonic and fermionic Markovian open systems interacting with stationary environments. show that accurate application partial secular approximation in derivation Bloch-Redfield master equation naturally induces symmetry on level, which may greatly reduce complexity by decomposing into independent blocks. Moreover, we prove that, if steady state system is unique, one single block contains all information about it, this...