Latest PRL in collaboration between IFUSP and UFABC

Hi everyone,

I would like to advertise our latest paper, published on Phys. Rev. Lett. on the relation between Thermodynamic Uncertainty Relations and Fluctuation theorems. This paper is a collaboration between myself, from IFUSP, Prof. André Timpanaro from UFABC and Dr. Giacomo Guarnieri and Prof. John Goold, from Trinity College, Dublin.

A. M. Timpanaro, G. Guarnieri, J. Goold, G. T. Landi, “Thermodynamic uncertainty relations from exchange fluctuation theorems.” Physical Review Letters, 123, 090604 (2019).

Nanoscaled engines and related devices can be prone to significant thermal and quantum fluctuations Recently, fundamental relations in thermodynamics have been discovered, called “thermodynamic uncertainty relations” (TURs). They provide universal bounds on the fluctuations of any current and relate them to the systems entropy production rate. In physical terms, this implies that the less noisy one wants a thermal machine to be, then the more one has to pay in dissipated heat. This has generated a new field known as thermodynamics of precision, which has implications in design of heat engines, biomolecular and even in the determining the accuracy of biological clocks.

TURs were initially thought to be a consequence of classical markovian dynamics, but here in this work we show that they are actually a consequence of the most refined version of the second law of thermodynamics, i.e. the fluctuation theorems. The discovery and experimental confirmation of fluctuation theorems has inspired a new microscopic description of quantum and classical thermodynamics which goes well beyond the regime of linear response and is a promising route to understand the thermodynamics of small quantum systems operating under non-equilibrium conditions.

In our paper we specifically focus on the class of fluctuation theorems known as exchange fluctuation theorems and derive the tightest TUR possible under these conditions. Our results both in the classical and quantum mechanical domain. Our paper shows how the notion of precision applies to a much larger class of physical systems than originally anticipated. We therefore expect that our findings will help understanding and controlling the next generation of nano-scale heat engines.

Latest paper by the group of Prof. Frederico Brito on non-thermal engines using superconducting qubits

Hi everyone,

Check out the latest paper by Cleverson Cherubim and Prof. Frederico Brito in collaboration with Prof. Sebastian Deffner, on the implementation of a non-thermal quantum heat engine using superconducting qubits.

https://www.mdpi.com/1099-4300/21/6/545

This work appeared as part of the specia issue of Entropy on Nonequilibrium Thermodynamics.

Paulo Nussenzveig @ Radio USP

Only recently it came to my knowledge that our colleague Paulo Nussenzveig (LMCAL-IFUSP) is the new raising radio star! More precisely, Paulo has a periodic insertion at Radio USP to talk (in Portuguese) about Science and Scientists. This week, he focus on the (always necessary!?) defense of the production of knowledge without obvious applicability…

Listen yourself!   Even better, become a listener, spread his words and make Paulo a radio star!

Congratulations, Paulo! University and Society pretty much need initiatives like that!

A resource theory for Maxwell’s demon’s

Hi everyone,

I’m here to publicize our latest paper, which was accepted on Quantum, on a resource theory for Maxwell’s demon’s:

https://arxiv.org/abs/1903.12629

We show that the set of resourceful states can be partitioned into 9 irreducible subsets, each with well defined (although not monotonic) temperatures. This, as we discuss, has dramatic consequences for Landauer’s principle.

Hope you enjoy!
All the best,

Gabriel Landi

Paraty 2019 – Time to register!

We would like to announce the “VII Paraty Quantum Information School and Workshop” (http://2019.paratyquantum.info/) that will take place in Paraty, Brazil from August 05 to 16, 2019.

We would be grateful if you could spread the word and bring the event to the attention of your group and to anyone else that might be interested. A pdf poster can be found in this link.

As in previous editions, the idea is to merge high level scientific exchange and a very pleasant atmosphere. The event will be held at the idyllic setting of Paraty, on Rio de Janeiro’s Costa Verde. The school runs from 5 to 9 August while the workshop takes place between 12 and 16 August 2019. Come and be part of this story!

Courses of the school:

Quantum-assisted machine learning in near-term quantum devices
Alejandro Perdomo-Ortiz (University College London)

Entangled Structures in Classical and Quantum Optics
Antonio Zelaquett Khoury (Fluminense Federal University)

Characterising quantum correlation via semi-definite programming
Daniel Cavalcanti (ICFO)

Quantum computing over the rainbow: continuous-variable quantum information in the optical frequency comb
Olivier Pfister (University of Virginia)

High-dimensional Quantum Information
Yelena Guryanova (IQOQI-Vienna)

Open Quantum System Dynamics
Sabrina Maniscalco (Turku University)

Application deadline is April 21st for the school and May 12th for the workshop.

http://2019.paratyquantum.info/application

We look forward to seeing you there!

The organizers

Barbara Amaral
Daniel Schneider Tasca
Marcelo Terra Cunha
Nadja Kolb Bernardes
Pablo Saldanha
Rafael Chaves