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.

Call to accelerate Quantum Technologies across Europe

Commissioner for the Digital Economy and Society, Gunther H. Oettinger, and Minister of Economic Affairs of the Kingdom of the Netherlands, Henk Kamp, today visited QuTech, a world-class institute building devices for Quantum Computers and Quantum Internet in Delft. The Commissioner and the Minister stated that action is needed to ensure Europe remains a world leader in Quantum Technology.

As competition in the field is becoming more intense globally (e.g. US and Asian competitors are actively investing), we must ensure that Europe’s innovators can translate scientific excellence into concrete applications and market results, thus offering Europe’s industry the opportunity to excel in the global sphere.

The community of researchers in Quantum Technologies is preparing a “Quantum Manifesto” describing a common European vision on how to maintain Europe’s world leadership in Quantum Technologies. The Manifesto should be ready for endorsement in May 2016. More details here.

The Applied Quantum Mechanics group @ UniMI fully supports this initiative and encourages all the members of the community and encourages everyone to endorse the Manifesto.

 

Nicola Lo Gullo joins AQM

Nicola Lo Gullo joined our group today with a post-doc position, funded by the QuProCS project (EU PROACTIVE H2020).

Nicola obtained his PhD in Theoretical Physics in 2013 at University College Cork. He has been a post-doc fellow at the Department of Physics of the University of Padova for three years.

Congratulations to Nicola and welcome aboard!

Quantum Technology Lab – Dipartimento di Fisica – Università degli Studi di Milano