PhD Seminars 2016

Here the calendar of PhD seminars 2016.

First-year students will present their research work during the PhD student Workshop on October 20 in Aula Consiglio.

Francesco Albarelli: Nonclassicality in continuous variables quantum systems.

Luigi Seveso: Ultimate precision: new developments in quantum estimation theory.

Giacomo Tanzi Marlotti: How to analyse condensed matter with Positronium.

The other students will give seminars in room A5/S2, fifth floor, LITA building.

Thursday, October 6, 13:00
Jacopo TrapaniOptimized protocols for discrimination of collective decoherence with classical environment

Thursday, October 6, 13:30
Matteo RossiProbing the diamagnetic term in light-matter interaction

Friday, November 18, 10:15
Giacomo Guarnieri: Characterization of heat in non-Markovian open quantum systems

and non-Markovian quantum jumps. Seminar about the 51th Winter School of Theoretical Physics (Ladek Zdroj)

Zeudi Mazzotta: Ps spectroscopy in the AEGIS experiment: a spectral analysis

and Applications of lasers in Medicine and Life Sciences, seminar about the school  LAMELIS – Advanced summer school on Lasers in Medicine and Life Sciences (Szeged, Hungary)

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.

Tony Apollaro joins AQM

Tony Apollaro joined our group on October, 1st with a post-doc position, funded by the QuProCS project (EU PROACTIVE H2020).

Tony obtained his PhD in Physics in 2006 from University of Calabria. Before joining AQM he has been a post-doc fellow at the Department of Physics of the University of Calabria.

Welcome Tony and keep up the good work!

Salvatore Lorenzo joins AQM

Salvatore Lorenzo joined our group on July, 1st with a post-doc position, funded by the QuProCS project (EU PROACTIVE H2020).

Tore obtained his PhD in Quantum Physics & Technology in 2013 from University of Calabria. Before joining AQM he has been a post-doc fellow at the Department of Physics of the University of Palermo.

Welcome Lorenzo and keep up the good work!

Steve Campbell talk on Thu, July 21

Next week Steve Campbell from Queen’s University Belfast will be visiting AQM. He will give a talk on Thursday, July 21, 14.00 at Aula Ottica Quantistica (5 piano LITA).

The cost of achieving finite time adiabatic dynamics

Recent years have witnessed a surge of interest in the study of thermal nanomachines that are capable of converting disordered forms of energy, such as heat, into useful work. It has been shown for both classical and quantum systems that external drivings can allow a system to evolve adiabatically even when driven in finite time, such techniques are commonly known as shortcuts to adiabaticity (STA) [1].

It was suggested to use such external drivings to render the unitary processes of a thermodynamic cycle quantum adiabatic, while being performed in finite time [2]. This could considerably augment the performance of nano-thermodynamic engines as work exchanges are extremised by adiabatic protocols. However, implementing additional external driving requires resources which affect the overall performance of the system [3].

We analyse the implications of considering the necessary power in applying these STA subsequently showing that this cost may outweigh the possible gains in work extraction for slow enough processes due to the relative degree of adiabaticity in the dynamics, while for relatively faster processes, the use STA can improve the work exchange. Furthermore, we devise a general strategy that exploits the definition of work as a two-time measurement of energy to improve the performance of work transfer. In particular, we show that it is possible to achieve sizable energy savings by gathering information from the first measurement and then applying a specifically tailored driving to the protocol. We apply our framework to driving a critical many-body system through a quantum phase transition, where the closing of the energy gap at the critical point makes the driving Hamiltonian of increasing complexity [4] and show that this complexity necessitates a divergence in the cost of achieving finite time adiabatic dynamics.

References:

[1] Shortcuts to adiabaticity, E. Torrontegui, S. Ibáñez, S. Martínez-Garaot, M. Modugno, A. del Campo, D. Guéry-Odelin, A. Ruschhaupt, Xi Chen, and J. G. Muga, Adv. At. Mol. Opt. Phys. 62, 117-169 (2013).

[2] More bang for your buck: Towards super-adiabatic quantum engines, A. del Campo, J. Goold, and M. Paternostro, Sci. Rep. 4, 6208 (2014).

[3] Cost of transitionless driving and work output, Yuanjian Zheng, Steve Campbell, Gabriele De Chiara, and Dario Poletti, arXiv:1509.01882.

[4] Shortcut to Adiabaticity in the Lipkin-Meshkov-Glick Model, S. Campbell, G. De Chiara, M. Paternostro, G. M. Palma, and R. Fazio, Phys. Rev. Lett. 114, 177206 (2015).

Marco Genoni joins AQM

Marco Genoni joins AQM as an Early-Stage Researcher within the EU project ConAQuMe (Marie Skłodowska-Curie Action H2020-MSCA-IF-2015.

Congratulations to Marco and welcome aboard!

Steve Campbell talk on Wed, April 6th

We announce the following talk, to be held on Wed, April 6th at 2.30 PM in Aula Polvani

Steve Campbell – Queen’s University Belfast

Non-equilibrium thermodynamics, equilibration, and thermometry of trapped cold atoms

Trapped ensembles of bosonic atoms represent an ideal candidate to simulate some of the most interesting aspects in the phenomenology of thermalisation and equilibration in quantum systems. In this talk I will focus on two widely applicable settings, namely harmonically trapped bosons and a loaded double well potential, and use the framework of non-equilibrium thermodynamics to the study the role quantum features play in setting the dynamic and static properties of the systems. I will attempt to show some qualitative evidence for the relation between the creation of entanglement and work performed on the system, and the relation to other interesting quantum phenomena such as Anderson’s Orthogonality catastrophe. Meanwhile, a quantum system’s ability to equilibrate and the role (or seeming lack there of) that genuinely quantum features play will also be presented. Finally, some recent progress in thermometry schemes for the double-well will be discussed.