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                        “Thermodynamics and Information at the nanoscale”

 

        Date:

    Download-files:

      Time:

 Thursday, 25. Oct. 2018

    Video-Recording for any system with MP4-support

   - Video.mp4  (ca.347 Mb)

 15:15 – 16:15

 

                                   

                                                            Janet Anders

                                                            (Exeter University)

 

Abstract :

This talk will cover recent advances in the field of Quantum Thermodynamics,

an emerging field that aims to uncover the thermodynamic laws at the nanoscale [1].

I will begin with explaining a (classical) nanoscale thermodynamic experiment with

optically trapped nanospheres that undergo Brownian motion in air [2].

These spheres experience a non-equilibrium situation due to heating from the

trapping laser. By using a suitable two-bath model to analyse the data, one can infer

the surface temperature of the trapped spheres and also observe temperature

gradients across the nanospheres. I will then move on to theoretical results concerning

thermodynamic work in the quantum regime, i.e. can a different amount of work be

extracted from a quantum system than from a classical system? To solve this we set up

a quantum thermodynamic process that removes quantum information in analogy to

Landauer’s erasure of classical information. The thermodynamic analysis of such a

process uncovers that work can be extracted from quantum coherences in addition to

the work that can be extracted from classical non-equilibrium states [3]. Finally,I will

report on a thermodynamic uncertainty relation that limits the accuracy of measuring

the temperature and energy of a thermal quantum system [4]. Corrections to the standard

uncertainty relation arise here because, unlike in standard thermodynamics, a small

system’s interaction with its environment is not negligible. The emerging relation unites

thermodynamic and quantum uncertainties for the first time.

 

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