QuICS - Quantum: Information, Complexity, Simulation

Session

Invited Speakers

30 Sept 2025, 11:30

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

5. Quantum-noise-limited and quantum enhanced optical magnetometry

Gianvito Lucivero

30/09/2025, 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.
In this talk I will describe quantum-noise limited magnetic gradiometers [1,2], which can operate with...

6. Measurement incompatibility in Bayesian multiparameter quantum estimation

Francesco Albarelli

30/09/2025, 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....

8. Quantum networks with Neutral Atoms in Optical Cavities

Emanuele Distante

30/09/2025, 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...

9. Maxwell’s demon for open quantum systems

Giacomo Guarnieri

30/09/2025, 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...

14. Spectral characterisation of biphoton states

Ilaria Gianani

01/10/2025, 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...

15. Continuous-variable QKD in modular star-network setup: advantage, limits and potential use with constrained devices

Carlo Ottaviani

01/10/2025, 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...

17. Static and dynamic topological phase transitions in open quantum systems

Carmine Antonio Perroni

01/10/2025, 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...

18. Multimode-cavity picture of non-Markovian waveguide QED

Dario Cilluffo

01/10/2025, 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...

23. Polariton quantum simulators: condensation and emerging supersolidity

Dario Gerace

02/10/2025, 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...

24. Quantum (inspired) algorithms for combinatorial optimization and equational reasoning

Ilaria Siloi

02/10/2025, 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...

26. Perfect state transfer between qubits by dispersion engineering in waveguide QED

Carlos Gonzalez-Ballestero

02/10/2025, 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...

32. A photon-atom interface at telecom wavelengths

Natalia Bruno

03/10/2025, 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...