June 5, 2019

Irreversibility is a longstanding puzzle in physics. While microscopic laws of motion are invariant under time reversal, all macroscopic phenomena have a preferred direction in time. Heat, for instance, spontaneously flows from hot to cold. Eddington has called this as...

December 14, 2018

Quantum resources can improve communication complexity problems (CCPs) beyond their classical constraints. One quantum approach is to share entanglement and create correlations violating a Bell inequality, which can then assist classical communication. A second approac...

October 18, 2018

In the continuum from quantum to classical, there exists a paradox. Classical machines like heaters cannot run in reverse (and effectively act as refrigerators) without extra energy. Such a scenario would violate the second law of thermodynamics, which states that entr...

December 15, 2017

Dr  Tiago Batalhão (our  former  PhD  student) was  awarded the best thesis Grand Prize in Natural Sciences and Engineering 2017 afforded by CAPES and the Conrado Wessel Foundation (CWF). This is the most prestigious Brazilian Post-gr...

December 6, 2016

A new implementation of a Maxwell’s demon can control entropy production in a quantum-mechanical system that is driven out of thermal equilibrium. Maxwell’s demon explores the role of information in physical processes. Employing information about microscopic degrees of...

November 3, 2015

Entropy production, a quantity associated with the emergence of the arrow of time, has been successfully measured in a microscopic quantum system. Irreversibility is one of the most intriguing concepts in physics. While microscopic physical laws are perfectly reversibl...

November 2, 2015

Within the broad research scenario of quantum secure communication, two-way quantum-key-distribution (TWQKD) is a relatively new proposal for sharing secret keys that is not fully explored yet. We analyse the security of TWQKD schemes that use qubits prepared in non-or...

November 1, 2015

It is well known that a quantum correlated probe can yield better precision in estimating an unknown parameter than classically possible. However, how such a quantum probe should be measured remains somewhat elusive. We examine the role of measurements in quantum metro...

October 31, 2015

Highlighted as Editors’ Suggestion. Research on the out-of-equilibrium dynamics of quantum systems has so far produced important statements on the thermodynamics of small systems undergoing quantum mechanical evolutions. Key examples are provided by the Crooks and Jarz...

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@Nature Communications: Reversion of heat flow using quantum correlations

June 5, 2019

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