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Chiara Macchiavello30/09/2025, 09:00
We review the concepts of entropic uncertainty relations (EUR) and consider the case of multiple observables. We investigate the corresponding additivity properties for both bipartite and multipartite systems where the EUR are defined in terms of the joint Shannon entropy of probabilities of local measurement outcomes. We show that the additivity of EUR holds only for EUR that involve two...
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Carlo Sias30/09/2025, 09:40
Understanding how strongly interacting particles self-organize in confined geometries is central to both fundamental physics and the development of controllable quantum systems. Two-dimensional Coulomb crystals of trapped ions provide an ideal platform for this purpose since their confinement can be precisely tuned, and they are considered one of the most promising routes toward scaling up...
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Daniel Braun30/09/2025, 10:50
With increasing complexity of quantum-information-processing devices, testing their functionality becomes a pressing and difficult problem. "Quantum Functional Testing" refers to the decision problem of accepting or rejecting a quantum device based on specifications provided by the producer and limited experimental evidence, combined with information gathering about failure mechanisms. The...
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Gianvito Lucivero30/09/2025, 11:30
Optically pumped magnetometers (OPMs), in which an atomic ensemble is optically polarized and its spin evolution is optically detected, represent a paradigmatic quantum sensing technology that applies to medical diagnostics, geophysics, space science and searches beyond the standard model.
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In this talk I will describe quantum-noise limited magnetic gradiometers [1,2], which can operate with... -
Francesco Albarelli30/09/2025, 12:00
Estimating physical parameters with high precision is a fundamental task in science and technology. In multiparameter scenarios, trade-offs between the precisions of different parameters naturally arise. For quantum systems, an additional intrinsic trade-off originates from measurement incompatibility, whereby the measurements optimal for individual parameters cannot be jointly implemented....
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Davide Rossini30/09/2025, 15:00
We study the nonstabilizerness, also named "quantum magic", in a variety of interacting quantum systems coupled with an environment. We first consider an infinite-range interacting spin-1/2 model, undergoing periodic kicking. In the thermodynamic limit, it is described by classical mean-field equations exhibiting regular and chaotic regimes. At finite size, the dynamics can be described...
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Emanuele Distante30/09/2025, 15:40
Quantum networks rely on efficient light–matter interfaces to connect optical photons with long-lived quantum memories. In this talk, I will present two complementary approaches using neutral atoms coupled to optical cavities. The first employs ordered arrays of individually trapped atoms in a hybrid tweezer–lattice architecture, enabling precise control, low decoherence, and highly efficient...
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Giacomo Guarnieri30/09/2025, 16:10
Feedback control of open quantum systems is of fundamental importance for practical applications in various contexts, ranging from quantum computation to quantum error correction and quantum metrology. Its use in the context of thermodynamics further enables the study of the interplay between information and energy, as exemplified by the famous Maxwell’s demon thought experiment that led to...
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Grazia Di Bello30/09/2025, 17:00
We investigate the dynamical and thermodynamic properties of the open Rabi model, a two-level system coupled to an oscillator beyond the rotating-wave approximation, and its two-qubit extension, focusing on equilibrium quantum phase transitions (QPTs) and dynamical quantum phase transitions (DQPTs) induced by environmental interactions. To address these problems, we employ the Density-Matrix...
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Elisa Ercolessi01/10/2025, 09:00
I will first describe some theoretical peculiarities in the definition of gauge theories with finite abelian or non-abelian groups on a lattice and then give some examples of quantum emulations of these hamiltonians with both hybrid and digital algorithms.
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Francesco Tafuri01/10/2025, 09:40
Superconducting circuits have been up to now the most successful platform to build a quantum computer, being developed and used by major international companies since early stages. Napoli has a long-standing experience on superconducting electronics and on its key device i.e. the Josephson junction, and has assembled the first quantum computer in Italy “Partenope” based on a 25-qubits...
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Andreas Winter01/10/2025, 10:50
A fundamental problem of inference is that of the observation of a long (ideally infinite) stationary time series of events, generated by a hidden Markov chain. What can we say about the internal structure of the hidden Markov model, aka the latent variables? If the system generating the observations is classical, we are looking to reconstruct the hidden" Markov chain from its "visible"...
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Ilaria Gianani01/10/2025, 11:30
Encoding information in the time–frequency domain demonstrates its potential for quantum information processing. It offers a novel scheme for communications with large alphabets, computing with large quantum systems, and new approaches to metrology. It is then crucial to secure full control on the generation of time–frequency quantum states and their properties. Characterizing the spectral...
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Carlo Ottaviani01/10/2025, 12:00
Continuous-variable systems offer a promising platform for quantum networks achieving high rates, while employing the existing infrastructure. Modular star networks was one of the attempts to extend CV-QKD towards networking schemes exploiting MDI setup. We first discuss the performance of this approach to implement quantum conferencing key agreement and quantum secret-sharing then, adopting...
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Simone Montangero01/10/2025, 15:00
We review recent advances in the development of efficient tree tensor network algorithms and their applications to quantum simulation, benchmarking, and theoretical interpretation. In particular, we present results on two- and three-dimensional systems, both in and out of equilibrium, including scattering processes and induced false vacuum decay in the two-dimensional quantum Ising model. We...
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Carmine Antonio Perroni01/10/2025, 15:40
A topological dynamical phase transition is induced between two planar superconducting phases. Using the Lindblad equation to account for the interactions of Bogoliubov quasiparticles among themselves and with the fluctuations of the superconducting order parameter, the relaxation dynamics of the order parameter is analyzed [1]. To characterize the phase transition, the fidelity and the...
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Dario Cilluffo01/10/2025, 16:10
We introduce a picture to describe and intrepret waveguide-QED problems in the non-Markovian regime of long photonic retardation times resulting in delayed coherent feedback. The framework is based on an intuitive spatial decomposition of the waveguide into blocks. Among these, the block directly coupled to the atoms embodies an effective lossy multimode cavity leaking into the rest of the...
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Leonardo Rossetti01/10/2025, 17:00
The use of coarse graining to connect physical and information theoretic entropies has recently been given a precise formulation in terms of “observational entropy”, a measure of the uncertainty about a system’s state that incorporates the specific operation an observer performs to acquire information about that state. Observers with access to limited sets of measurements observe an entropy...
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Rosario Fazio02/10/2025, 09:00
Monitored many-body quantum system shows a rich phenomenology that is invisible at the level of its average state, the density matrix. Measurement induced phase transitions were discovered in a variety of systems ranging from quantum circuits in the presence of projective measurements to unravelled dynamics of open systems. I will analize a variety of dynamical transitions, and the...
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Giacomo Lamporesi02/10/2025, 09:40
In quantum field theory, quantum fluctuations can trigger the decay of a field from a metastable state (false vacuum) to the ground state (true vacuum) through the macroscopic tunneling across a many-body energy barrier [1]. False vacuum decay, which is thought to manifest via the spontaneous nucleation of spatially localized bubbles, is a fascinating phenomenon for a rich variety of systems,...
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Antonio Acin02/10/2025, 10:50
When studying many-body systems, two approaches have been considered so far: analytical derivations and variational methods. The first provide exact results, as they do not involve any approximations, but scale exponentially with the number of particles, while the second scale much better but only provide estimates with no theoretical guarantees. Polynomial optimisation methods offer an...
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Dario Gerace02/10/2025, 11:30
Supersolidity is a counter-intuitive and very fascinating phase of matter, predicted more than 50 years ago and realized only in recent years in various configurations by using condensates of cold atomic clouds: a very coherent quantum system that simultaneously behaves as a superfluid, i.e., having the characteristic property of flowing without viscosity or friction, and as a system...
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Ilaria Siloi02/10/2025, 12:00
Tensor network (TN) methods have emerged as a powerful tool for addressing high-dimensional problems, with applications spanning quantum many-body physics and machine learning. We show how combinatorial problems can be tackled through a synergy of quantum-inspired algorithms and novel quantum formulations. First, we address mission planning for Earth-observation satellites, mapping a...
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Darrick Chang02/10/2025, 15:00
One of the most exciting directions associated with the rapid advance of quantum science is the possibility to utilize synthetic quantum systems to realize and explore strongly correlated quantum phenomena. Generally, however, this regime remains challenging to access with quantum atom-light interfaces for two reasons. First, such systems still suffer from significant dissipation, particularly...
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Carlos Gonzalez-Ballestero02/10/2025, 15:40
A propagating photon emitted by a qubit via spontaneous decay has an exponential spatial profile that is not time-reversal invariant [1,2]. As a consequence, if such photon propagates in a medium with linear dispersion relation, it cannot be perfectly absorbed by a second qubit. Even in the ideal case of a lossless, perfectly chiral 1D waveguide the maximum achievable occupation of the second...
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Rosa Lucia Capurso02/10/2025, 16:10
Waveguide Quantum Electrodynamics (Waveguide QED) is a promising and versatile platform for studying fundamental light-matter interactions and quantum technology implementations. Notably, interesting effects emerge when two or more quantum emitters are coupled to the waveguide, including collective phenomena, e.g., superradiance and formation of bound states in the continuum (BICs). An...
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Davide Rinaldi02/10/2025, 17:00
Quantum technologies must be both miniaturized and effectively scaled in order to achieve a high level of competitiveness and efficiency. However, devices operating at the nanoscale necessitate the management of extremely small quantities of energy. But how can fluctuations be properly accounted for? Indeed, the smaller the amount of energy involved, the more significant the relative impact of...
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Peter Rabl03/10/2025, 09:00
In this talk, I will present recent and ongoing work on the application of semi-classical methods, such as the discrete truncated Wigner approximation and quantum state diffusion simulations, for simulating dissipative quantum spin models. Specifically, I will discuss the use of these techniques in the context of superradiance and demonstrate that, even in the presence of squeezing...
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Milena D'Angelo03/10/2025, 09:40
We shall present recent advances in correlation imaging modalities enabling scanning-free high-resolution hyperspectral imaging, 3D imaging and 3D microscopy, with at least one order of magnitude advantage over typical tradeoffs such as resolution versus depth of field and spatial versus spectral resolution.Both entangled light beams and chaotic light are employed, depending on the specific...
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Rafał Demkowicz-Dobrzański03/10/2025, 10:50
Recent theoretical developments have rendered quantum metrology a mature field, where some of the most fundamental question have been answered and efficient computational tools developed. We have now a full understanding of quantum metrological potential in case of noisy single parameter estimation models, provided the noise may be assumed to be Markovian. Nevertheless, non-Markovian models...
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Natalia Bruno03/10/2025, 11:30
Enabling communication between quantum devices, such as clocks, computers, and simulators has the potential to significantly enhance the capabilities of their applications, such as quantum sensing and computing.The key to achieving this lies in establishing efficient communication channels among these quantum devices even over a long distance, which involves the exchange of qubits encoded in...
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Paolo Scarafile03/10/2025, 12:00
We investigate the thermodynamic properties of the uniform real-phased submanifold in $n$-qubit systems ($(\pm)$-state), represented as a classical ensemble of $2^n$ spins subject to a potential encoding multipartite entanglement. For small system sizes ($n \leq 6$), we perform exact enumeration, enabling a complete statistical characterization of the energy landscape and associated...
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Aaqib Ali03/10/2025, 12:30
Error filtration is a hardware scheme that mitigates noise by exploiting auxiliary qubits and entangling gates. Although both signal and ancillas are subject to local noise, constructive interference and post-selection allow us to reduce the noise level in the signal qubit. Here we highlight the relation between error filtration and error detection codes, and determine the optimal codes that...
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