Category Archives: Visiting

Tommaso Tufarelli visiting AQM

Tommaso Tufarelli, from University of Nottingham, is visiting AQM from Tuesday 10 to Thursday 12 January.

He will deliver a talk on Wednesday, 11 January at 12:30 in Auletta Ottica Quantistica (5 piano LITA)

Refining the Dicke Model

I will start by reviewing an interesting signature of the “A^2 term” in a simple Dicke model featuring two coupled oscillators [first reported in Phys. Rev. A 91, 063840 (2015)]. Then, I will discuss conditions under which such model could be derived as an approximation to a minimal coupling Hamiltonian in Coulomb-gauge, showing that some additional Hamiltonian terms, not usually discussed in the literature, should be present in the ultrastrong coupling regime.

Andrea Smirne visiting

Andrea Smirne, from Ulm University, will be visiting the Physics Department from Monday, 12 December. He will give a lecture and a talk about quantum parameter estimation.

Monday 12 December, 8.45,  Aula I

Lecture Classical and quantum limits to the achievable precision in parameter estimation

Wednesday 14 December, 13.30, Aula Bonetti

Seminar Overcoming the classical limits for frequency estimation in the presence of a general class of open-system dynamics

Continue reading Andrea Smirne visiting

Talk by Matteo Brunelli on Tue, Oct 25

Matteo Brunelli (Queen’s University Belfast) will be visiting us from 24 to 28 October 2016.

He will give a talk on Tuesday 25 October at 12 am in Aula Ottica Quantistica (A5/S2), 5th floor, LITA building, entitled:

Irreversibility and correlations in mesoscopic quantum systems: an optomechanical route

Abstract

In this talk I will present a theoretical framework to assess the degree of irreversibility of a dissipative process acting on an interacting quantum system. In particular, the entropy production rate of coupled quantum harmonic oscillators can be expressed in a simple form. I will apply the result to the analysis of the optomechanical interaction between a nano-mechanical resonator and a cavity field, and show the agreement between the predictions of our framework and experimental data.  In the second part, I will present a quantitative relation between the entropy production rate and the correlations, both total and quantum, built between the mechanical resonator and the cavity field.

Paolo Giorda’s talk

On Wednesday 21 October, 2PM AQM Room, Paolo Giorda (INRIM Torino) will be with us and deliver a talk entitled

Quantum effects in open systems dynamics and their roots in the Decoherent Histories Approach. An application to energy transfer processes in simple photosynthetic systems: the Quantum Recoil Avoiding effect and energy transfer efficiency.

 

Stefano Pirandola talk at AQM

We are glad to announce that Stefano Pirandola (University of York) will deliver a talk on Tuesday 14 July at the Aula di Ottica Quantistica (5th floor LITA building). An abstract of the talk follows.

Stefano Pirandola (University of York)

Relay-based protocols in correlated-noise Gaussian environments

We consider continuous-variable protocols exploiting a quantum relay, such as entanglement swapping, quantum teleportation, and QKD. Their theory is extended to a non-Markovian spatial model of decoherence characterized by correlated Gaussian noise. Even if bipartite entanglement is completely lost at the relay, we show that the various protocols can progressively be reactivated by the separable noise-correlations of the environment.

Elsi-Mari Laine and Massimo Borrelli visiting AQM

Elsi-Mari Laine and Massimo Borrelli from the University of Turku (Finland) will visit us from Monday 13 to Friday 17 July.

They will deliver two talks on Wednesday 15 July.

Room: Aula di Ottica Quantistica (5th floor LITA building)

17:00: Elsi-Mari Laine (University of Turku)

“Dynamics of incompatibility of quantum measurements in open systems”

The non-classical nature of quantum states, whether depicted with entanglement or quantum discord, is often considered as resource for quantum information protocols. However, the non-classicality of a quantum system cannot be encapsulated as a property of the state alone, as the set of available measurements used to extract information on the system may also be restricted. In this work we study how the non-classicality of quantum measurements, quantified via their incompatibility, is influenced by quantum noise and, further, how a non-Markovian environment may help us in maintaining the measurement resources.

17:30: Massimo Borrelli (University of Turku)

“Quantum probing of complex systems”

Quantum probes are controllable quantum objects that can be used to investigate complex systems via tailored, engineered interactions. By monitoring the dynamics of the probe(s) one can directly access some of the complex system’s features, such as average quantities and correlations. In this talk we are going to give a brief introduction to quantum probes, with particular emphasis on the open-system approach. Furthermore, we are going to discuss a few examples of successful applications of quantum probing to many-body systems.