Conveners
Talks
- Gabriele Spada
Talks
- Leonard Logaric (Trinity College Dublin)
- Pietro Campana
Talks
- Giuliano Chiriacò (University of Catania)
Talks
- Gian Marcello Andolina (College de France, Paris.)
- Vincenzo Ardizzone (CNR Nanotec)
Talks
- Michele Dall'Arno (Toyohashi University of Technology, Aichi-ken, Japan)
- Denis Vasilyev (University of Innsbruck / Institut für Quanteninformation)
- Ivan Panadero Muñoz (Arquimea Research Center / Universidad Carlos III de Madrid)
- Christian Schilling (LMU Munich)
Talks
- Nicola Carlon Zambon (ETH Zürich)
- Giuseppe Emanuele Chiatto (Università degli Studi di Catania)
Talks
- Markus Schmitt (Regensburg University)
Talks
- Matthew Eiles (Max Planck Institute for the Physics of Complex Systems)
- Francesco Preti (FZJ)
- Oriel Kiss (CERN)
Talks
- Marco Tesoro (Univesità di Padova)
- Pietro Bovini (Alma Mater Studiorum Università di Bologna)
Talks
- Luis Colmenarez (Max Planck Institute for the Physics of Complex Systems)
- Narendra Hegade (Kipu Quantum)
Talks
- Alessandro Summer (Trinity College Dublin)
Talks
- Raphael Holzinger (Institute for Theoretical Physics, University of Innsbruck)
- Enrico Di Benedetto (Università degli Studi di Palermo)
- Bence Gábor (HUN-REN Wigner RCP)
Talks
- Marco Govoni (University of Modena and Reggio Emilia)
Talks
- Taira Giordani (Sapienza University of Rome)
Talks
- Jeremy C. Adcock (University of Bristol / Qontrol Systems)
Talks
- Maja Colautti (CNR-INO, c/o LENS)
Dual-unitary circuits are a class of quantum systems for which exact calculations of various quantities are possible, even for circuits that are nonintegrable. The array of known exact results paints a compelling picture of dual-unitary circuits as rapidly thermalizing systems. However, in this Letter, we present a method to construct dual-unitary circuits for which some simple initial states...
The study of the dynamics of open quantum systems is of great importance both for the theoretical implications and for the practical applications to quantum technologies. While the Markovian regime is a good approximation in most cases, many systems and environments display a non-Markovian behavior. In this talk, I will present some work done on the dynamics of non-Markovian systems, including...
Collective effects, such as Dicke superradiant emission, can enhance the performance of a quantum device. Here, we study the heat current flowing between a cold and a hot bath through an ensemble of N qubits, which are collectively coupled to the thermal baths. We find a regime where the collective coupling leads to a quadratic scaling of the heat current with N in a finite-size scenario....
Exciton-polaritons are hybrid light-matter excitations arising from the strong coupling between an electromagnetic mode and an excitonic transition of a semiconductor material. As mixed particles, they get the best of two worlds: low effective mass and long coherence from their photonic component and strong interactions from their matter component.
This unique mixture of features makes them...
Describing strongly interacting electrons is one of the crucial challenges of modern quantum
physics. A comprehensive solution to this electron correlation problem would simultaneously
exploit both the pairwise interaction and its spatial decay. By taking a quantum information
perspective, we explain how this structure of realistic Hamiltonians gives rise to two
conceptually different...
Nitrogen-vacancy (NV) centers in diamond have emerged as exceptionally promising candidates for the implementation of quantum technologies. These centers exhibit atom-like properties, characterized by long-lived spin quantum states and well-defined optical transitions, all within a robust solid-state device. Notably, the electron spins of NV centers can be easily initialized, controlled, and...
Any circuit is in one-to-one correspondence with a logical table that specifies, upon any given input state, what the output state of the ideal circuit should be. Since classical states are perfectly distinguishable in principle, at least at a fundamental level the calibration of classical circuits does not therefore present any difficulty. This is in stark contrast with the quantum case...
Quantum sensors are an established technology that has opened up new possibilities for precision sensing in various scientific fields. The use of entanglement for quantum-enhancement is paving the way for the development of next-generation sensors that can reach the ultimate precision limits set by quantum physics. However, determining how state-of-the-art sensing platforms may be used to...
Optomechanics studies the interaction of light with moving objects, an essential resource for sensing, metrology, and the investigation of fundamental aspects of quantum mechanics with mesoscopic systems. By eliminating clamping losses and the background gas, optically levitated objects can reach an extreme degree of isolation from the environment, enabling free-space quantum control of...
The behavior of many dissipative systems is generally described by a non-Markovian dynamics. Memory effects associated to non-Markovianity may lead to revival of coherence and entanglement and may be exploited as resources for quantum computation [1,2]. In this work, we study a toy model system of a qubit coupled to an incoherent impurity [3-5] which has been shown to exhibit a transition from...
Experiments with Rydberg atom arrays open up new possibilities to investigate two-dimensional interacting quantum systems away from equilibrium and they call for us to push also numerical simulations in this regime. I will discuss how combining the time-dependent variational principle with two families of ansatz for the variational wave function — artificial neural networks and tree tensor...
Quantitative characterization of two-qubit entanglement purification protocols is introduced. Our approach is based on the concurrence and the hit-and-run algorithm applied to the convex set of all two-qubit states. We demonstrate that pioneering protocols are unable to improve the estimated initial average concurrence of almost uniformly sampled density matrices, however, as it is known, they...
When a Rydberg atom and a ground state “perturber” atom encounter one another in an ultracold gas, they interact via an oscillatory potential mediated by the scattering of the Rydberg electron off of the perturber. Sufficiently deep wells form in the oscillations of this potential that the perturber becomes trapped, binding the two atoms together into a molecule. This unusual mechanism is also...
Ultracold dilute Bose-Fermi mixtures are systems that offer a large degree of tunability and are highly controllable, allowing for the investigation of substantially different conditions and quantum effects in matter. In such a mixture with a pairing interaction, one can study the competition between the formation of fermionic composite molecules and the tendency of bosons towards...
Current public-key cryptography standard is based on the RSA algorithm [1], whose security relies on the practical difficulty of factoring semiprimes as the product of two large prime numbers. While traditionally applied for encryption, lattice-based cryptography, as exemplified by Schnorr's algorithm [2], offers a different avenue to decompose RSA keys. This algorithm encodes prime factors...
I will introduce digitized counterdiabatic quantum computing (DCQC) as a novel paradigm for compressing digital quantum algorithms. It consists of a suitable digitization of the accelerated counterdiabatic dynamics of an adiabatic quantum computation, which encodes the chosen industry use case. I will exemplify DCQC to the class of optimization problems: digitized counterdiabatic quantum...
One of the key aspects in the realization of large-scale fault-tolerant quantum computers is quantum error correction (QEC). The first essential step of QEC is to encode the logical state into physical qubits in a fault-tolerant manner. Recently, flag-based protocols have been introduced that use ancillary qubits to flag harmful errors. However, there is no clear recipe for finding a compact...
Quantum statistical mechanics allows us to extract thermodynamic information from a microscopic description of a many-body system. A key step is the calculation of the density of states, from which the partition function and all finite-temperature equilibrium thermodynamic quantities can be calculated. In this work, we devise and implement a quantum algorithm to perform an estimation of the...
Efficient transport and harvesting of excitation energy under low light conditions is an important process in nature and quantum technologies alike. Here we formulate a quantum optics perspective to excitation energy transport in configurations of two-level quantum emitters with a particular emphasis on eciency and robustness against disorder. We study a periodic geometry of emitter rings with...
Flat Bands (FBs) are dispersionless energy bands, feature that makes such systems extremely sensitive to small perturbations and non-linearities. Here, we examine the case in which the non-linearity is introduced through the coupling of two-level emitters (almost) resonant to the FB energy.
Surprisingly, we find that a FB seeds a new type of detuning independent exponentially localized...
We experimentally demonstrate an optical bistability between two hyperfine ground states of trapped, cold atoms, using a single mode of an optical resonator in the collective strong coupling regime. Whereas in the familiar case, the bistable region is created through atomic saturation, we report an effect between states of high quantum purity, which is essential for future information storage....
Quantum computers hold promise to improve the efficiency of quantum simulations of materials and to enable the investigation of systems and properties that are more complex than tractable at present on classical architectures. Here, we discuss a computational framework to carry out electronic structure calculations of solids on noisy intermediate-scale quantum computers using embedded Green’s...
Single-photon sources based on semiconductor quantum dots find several applications in quantum
information processing due to their high single-photon indistinguishability, on-demand generation, and low
multiphoton emission. In this context, the generation of entangled photons represents a challenging task with
a possible solution relying on the interference in probabilistic gates of...
Over the past two decades, quantum photonic devices have exploded in scale and complexity, with application to every corner of quantum information science. However, the writing is on the wall: to make scalable photonic quantum technology, we must do away with postselection and its exponentially poor scaling. This means building dynamic quantum circuits, featuring measurement and feedforward,...
The generation and manipulation of quantum states of light is required for key applications, such as photonic quantum simulation, linear optical quantum computing, quantum communication protocols, and quantum metrology. In this context, I will present our recent achievements in using single organic molecules as bright and stable sources of coherent single photons in the solid state. Among our...
The Multi-Reference Electronic Structure Theory involves choosing an active space with knowledge of the subspace's spatial and energetic information within the Hilbert space of a molecular electronic Hamiltonian that exhibits strong correlation. This process can be automated with the help of an AI assistant. This paper presents such an assistant that utilizes tools like the Approximate Pair...