Gianfranco Cariolaro, Professor Emeritus of Quantum Communications at the Department of Information Engineering of the University of Padova, will be visiting AQM on Tue March 7, 2017 and will give a seminar in Aula Polvani at 14:30, entitled
Konrad Banaszek from University of Warsaw is going to visit us from Monday 27 Feb (afternoon) to Thursday 2 Mar 2017.
On Tuesday, Feb 28th, 12 AM Konrad is going to deliver a seminar entitled
Restoring quantum enhancement in two-photon interferometry
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.
Elsi-Mari and Massimo Borrelli from University of Turku will visit us from 19 to 22 December.
Elsi-Mari is going to deliver the following seminar on Tue 20, 12 AM, Room A5/S3 (LITA, 5th floor)
Problem of coherent control in non-Markovian open quantum systems
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
The BIG Bell Test (BBT) is a worldwide project to bring human unpredictability (randomness) to cutting-edge physics experiments. It may be surprising, but there are aspects of physical reality that can only be understood by asking unpredictable questions of nature. The most famous experiment of this kind is the Bell test. In the BBT, laboratories around the world (see map) will prepare entangled quantum particles: electrons, photons, atoms, and superconductors. Through the Internet, an army of participants, the Bellsters, will shower these particles with unpredictable, high-speed “questions” (measurements, in fact). Together, we will perform unique quantum physics experiments, including the first human-driven Bell test.
The experiments will all take place on Wednesday, November 30th and everyone can contribute by going to the project website and playing the games proposed.
Claudia Benedetti, Marco Genoni and Stefano Olivares from the Applied Quantum Mechanics Group will give an introductory seminar aimed at high-school and university students on Tuesday, November 29th at 14:30 in Aula A of the Physics Department.
A blog article on the experiment by Matteo Rossi:
Further material is available on the ICFO website:
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 Trapani: Optimized protocols for discrimination of collective decoherence with classical environment
Thursday, October 6, 13:30
Matteo Rossi: Probing 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)
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
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.
On Thursday 15 September, 2016 at 12 AM in Aula Ottica Quantistica, A5/S2 LITA, Francesco Albarelli will give a talk about
Measurement-based continuous-variable quantum computation and simulation
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) .
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 . 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 .
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  and show that this complexity necessitates a divergence in the cost of achieving finite time adiabatic dynamics.
 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).
 More bang for your buck: Towards super-adiabatic quantum engines, A. del Campo, J. Goold, and M. Paternostro, Sci. Rep. 4, 6208 (2014).
 Cost of transitionless driving and work output, Yuanjian Zheng, Steve Campbell, Gabriele De Chiara, and Dario Poletti, arXiv:1509.01882.
 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).