From strong passivity to extended second law of thermodynamics and new thermodynamic predictions on quantum microscopic systems

Last updated October 4, 2017 by Alessandro Ferraro

Tuesday, September 26 2017, 04:00 PM, Room 01/052, Lanyon Building

Speaker: Raam Uzdin (Technion – Israel Institute of Technology)

To thermodynamically address quantum nanoscopic scenarios that involve very small thermal baths and strong system-bath correlation, we suggest a new framework that is based on the principle of passivity. Passivity allows to get many thermodynamic inequalities that constrain observables that were so far outside the scope of thermodynamics. As an example we derive lower and upper bounds on the system-bath energy covariance in Jaynes-Cummings model. Using a stronger version of the passivity principle, we extend the second law to handle initial system-bath correlation (which is common in microscopic strong system-bath coupling scenarios). In addition, it is shown that passivity-based inequalities can detect “sub-Maxwellian demons” that apply subtle feedback on the system without violating the standard second law. Finally an intrinsically quantum feature of strong passivity is exploited to assign a thermodynamic cost for coherence generation.


We are a Research Cluster of the School of Mathematics and Physics at Queen’s University Belfast in Northern Ireland. Our research interests are focused primarily on computational and theoretical physics.

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