Creating and sharing knowledge for telecommunications

Seminar - Thermodynamics of quantum coherence


on 24-02-2014

... César Rodríguez-Rosario (University of Bremen)

Date & time: 27/02/2014 at 10:30.

Location: Seminar Room (2.8.3), Physics Department, Instituto Superior Técnico, Lisbon.

Joint session with the Physics of Information Seminar. Please note exceptional day, time and room.


Quantum decoherence is seen as an undesired source of irreversibility that destroys quantum resources. Quantum coherences are a property that vanishes at thermodynamic equilibrium. Away from equilibrium, quantum coherences challenge the classical notions of a thermodynamic bath in a Carnot engines, affect the efficiency of quantum transport, lead to violations of Fourier's law, and can be used to dynamically control the temperature of a state. However, the role of quantum coherence in thermodynamics is not fully understood.

We will show that the relative entropy of a state with quantum coherence with respect to its decohered state captures its deviation from thermodynamic equilibrium. As a result, changes in quantum coherence can lead to a heat flow with no associated temperature, and affect the entropy production rate. From this, we derive a quantum version of the Onsager reciprocal relations that shows that there is a reciprocal relation between thermodynamic forces from coherence and quantum transport. Quantum decoherence can be useful and offers new possibilities of thermodynamic control for quantum transport and to understand transport in photosynthetic complexes.

Quantum Computation and Information Seminar
http://math.ist.utl.pt/seminars/qci/?action=next

Support: Phys-Info (IT), SQIG (IT), CFIF and CAMGSD, with support from FCT, FEDER and EU FP7, namely via projects PEst-OE/EEI/LA0008/2013, Landauer (GA 318287) and PAPETS (323901).

http://math.ist.utl.pt/seminars/qci/?action=next

Position statement on the FCT adopted metrics based on ORCID\SCOPUS


on 22-02-2014

... A position statement signed by the majority of the Associate Laboratories, University Departments and Research Institutions in the area of Computer Science and Engineering (CSE), was addressed to the President of FCT expressing deep concern about the recent FCT policy of using ORCID\SCOPUS to assess individual and research units' bibliographic productivity and impact.

Out from other databases covered by ORCID, SCOPUS database selected by FCT as the single one to assess and rank the Portuguese research institutions, has very limited coverage of the CSE area.

The position statement addressed to the President of FCT was the last resort after several failed attempts to alert FCT for the negative impact on fairness and equity of bibliometric evaluation result based solely on SCOPUS.

The position statement is posted publicly to the attention of the Evaluation Panels.

http://www.it.pt/web_templates_files/PositionStatement.pdf