BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:CMSP Seminar: What constrains the precision of a quantum heat engi
 ne?
DTSTART;VALUE=DATE-TIME:20260709T090000Z
DTEND;VALUE=DATE-TIME:20260709T100000Z
DTSTAMP;VALUE=DATE-TIME:20260705T162837Z
UID:indico-event-11396@ictp.it
DESCRIPTION:\n	Janine Splettstößer\n	(Chalmers University of Technology\
 , Sweden)\n \n\n	\n	Abstract:\n	In small-scale thermodynamic devices\, fl
 uctuations play an important role (in contrast to standard classical therm
 odynamics). While close to equilibrium fluctuation-dissipation theorems pr
 escribe how the fluctuations are connected to the desired average output o
 f a device\, this is much more difficult to identify far from equilibrium.
 \n	Interestingly\, the thermodynamic properties of a process or of a syste
 m constrain fluctuations. This has been studied in terms of thermodynamic 
 and kinetic uncertainty relation (TURs and KURs) - in particular in weakly
  coupled open quantum systems. However\, steady-state thermoelectric heat 
 engines operate typically far from equilibrium and the coupling to contact
 s can be strong.\n	In this presentation\, I will show our recent results o
 n thermodynamic and kinetic constraints on fluctuations. I will focus on i
 mplications for quantum heat engines\, namely quantum systems subject to t
 emperature differences which can be exploited for power production at smal
 l scales.\n	I will  start by introducing fluctuation-dissipation bounds\,
  which constrain the charge-current fluctuations by the dissipated power\,
  both in steady-state [1]\, as well as in time-dependently driven systems 
 [2]. In contrast to the well-known fluctuation-dissipation theorem\, these
  bounds are particularly predictive for large temperature bias.\n	Furtherm
 ore\, I will show that KUR-like constraintss can be derived from scatterin
 g theory\, where the “activity”\,  is replaced by activity-like trans
 port quantities like particle-current noise and transport bandwidth [3\,4]
 .\n	While these constraints are limited to systems described by linear Ham
 iltonians\, we have recently developed a quantum KUR via the Cramér-Rao b
 ound\, where the quantum Fisher information takes the role of a partial dy
 namical activity bounding precision together with a susceptibility term in
  response to changes in the system-bath coupling strength [5].\n	 [1] L. 
 Tesser\, J. Splettstoesser: Out-of-Equilibrium Fluctuation-Dissipation Bou
 nds. Phys. Rev. Lett. 132\, 186304 (2024)[2] L. Tesser\, J. Balduque\, J. 
 Splettstoesser: Fluctuation-dissipation bounds for time-dependently driven
  conductors. arXiv:2509.07583 (2025)[3] D. Palmqvist\, L. Tesser\, J. Sple
 ttstoesser: Kinetic Uncertainty Relations for Quantum Transport. Phys. Rev
 . Lett. 135\, 166302 (2025)[4] D. Palmqvist\, L. Tesser\, J. Splettstoesse
 r: Combining kinetic and thermodynamic uncertainty relations in quantum tr
 ansport. Quantum Sci. Technol. 10\, 035059 (2025)[5] D. Palmqvist\, L. Tes
 ser\, J. Splettstoesser: Susceptibility-kinetic uncertainty relations for 
 quantum systems. arXiv:2607.01035 (2026)\n	 \n\n	Zoom registration link:h
 ttps://zoom.us/meeting/register/xm5Tt8oWR0KwK4nyGv3waQ\n	 \n\n//indico.ic
 tp.it/event/11396/
LOCATION:Lagrange Lecture Hall (Leonardo Building\, terrace level) and via
  Zoom
URL://indico.ictp.it/event/11396/
END:VEVENT
END:VCALENDAR