QuICS - Quantum: Information, Complexity, Simulation

Session

Keynote Speakers

30 Sept 2025, 09:00

Conference Room (Bari (Italy) - Palazzo dell'Acqua)

3. Multiple-observable entropic uncertainty relations and entanglement detection

Chiara Macchiavello

30/09/2025, 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...

4. Structural transitions in two-dimensional Coulomb crystals

Carlo Sias

30/09/2025, 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...

2. Quantum functional testing

Daniel Braun

30/09/2025, 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...

7. Nonstabilizerness in the monitored dynamics of complex quantum systems

Davide Rossini

30/09/2025, 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...

11. Finite Group Lattice Gauge Theories and their Quantum Simulations

Elisa Ercolessi

01/10/2025, 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.

12. The Josephson effect moving Quantum Computation through the Macroscopic Quantum

Francesco Tafuri

01/10/2025, 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...

13. Hidden Markov models - classical and quantum mechanisms, and beyond

Andreas Winter

01/10/2025, 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"...

16. Tensor Network Algorithms for Quantum Simulation

Simone Montangero

01/10/2025, 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...

20. Transitions in monitored quantum circuits

Rosario Fazio

02/10/2025, 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...

21. False vacuum decay in ferromagnetic superfluids

Giacomo Lamporesi

02/10/2025, 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,...

22. Certified many-body physics

Antonio Acin

02/10/2025, 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...

25. Quantum spin liquids in cavity QED

Darrick Chang

02/10/2025, 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...

29. Semiclassical simulations of dissipative quantum many-body systems

Peter Rabl

03/10/2025, 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...

30. Correlation imaging, from 3D to hyperspectral

Milena D'Angelo

03/10/2025, 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...

31. Quantum metrology - almost perfect theoretical framework with just a few cracks

Rafał Demkowicz-Dobrzański

03/10/2025, 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...