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SUMMARY:Scattering and thermalization: wave-particle duality hits quantum 
 thermodynamics - Juan MR Parrondo (Universidad Complutense de Madrid)
DTSTART:20240206T130000Z
DTEND:20240206T140000Z
UID:TALK209740@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:An interesting class of open quantum systems is defined by the
  so-called repeated interaction scheme\, where the system interacts sequen
 tially with small and fresh subsystems or units coming from a reservoir. T
 he interaction is unitary and relatively easy to analyze. However\, it mus
 t be switched on and off and these actions may introduce and/or extract en
 ergy\, performing work and preventing thermalization when the reservoir is
  a thermal bath.  As a consequence\, the repeated interaction scheme canno
 t be used to model thermostats in quantum thermodynamics. In a series of p
 apers\, we have partly overcome this problem by considering collisional re
 servoirs where the units are quantum particles with spatial degrees of fre
 edom. The whole setup is autonomous and can be studied using quantum scatt
 ering theory. The work to switch on and off the interaction now is due to 
 the interaction between the system and the kinetic energy of the incident 
 particle. Then\, if the units are in thermal equilibrium\, this energy exc
 hange becomes heat\, and thermalization is recovered. However\, we have pr
 oven that thermalization requires that the wave function of the incident p
 articles is narrow in momentum representation\, i.e.\, the dispersion of t
 he momentum must be very small. This condition conflicts with the requirem
 ent that the particle is localized in space in order to observe well-defin
 ed collisions and also poses the fundamental question of the nature of the
  wave function of particles that effuse from a gas at equilibrium.\n\n\nJo
 in Zoom Meeting\nhttps://cam-ac-uk.zoom.us/j/81067386873?pwd=enExTFBpY3EvZ
 DFtV2NBSGxxMVBSZz09\n\nMeeting ID: 810 6738 6873\nPasscode: 3141
LOCATION:Center for Mathematical Sciences\, Lecture room MR4 (online talk)
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