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** “Thermodynamics and
Information at the nanoscale”**

** **

Date: |
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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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