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SUMMARY:Thermodynamic Signatures of Coherent Initial Ensembles
DTSTART:20260410T110000Z
DTEND:20260410T130000Z
DTSTAMP:20260409T110700Z
UID:indico-event-9652@indico.fysik.su.se
DESCRIPTION:Speakers: Pranay Nayak (Stockholm University)\n\nStandard trea
 tments of quantum work using projective energy measurements erase initial 
 coherence and alter the dynamics\, thereby failing to capture the thermody
 namic effects of coherent superpositions of energy eigenstates in an ensem
 ble of initial states. In this article\, we use an operational work defini
 tion that is non-intrusive\, applying it to the case of a driven dissipati
 ve qubit\, where the qubit’s initial preparation comprises coherent supe
 rposition states\, while the driving is coherence–less. We derive an evo
 lution equation for the moment generating function for this work\, faithfu
 lly capturing the thermodynamic signature of coherent superpositions in th
 e initial ensemble. We demonstrate that different initial ensembles that c
 orrespond to the same density matrix upon ensemble average\, while having 
 the same average work\, display different work fluctuations. For monotonic
  driving\, we show that fluctuations are maximum for coherence-less initia
 l ensembles. As an application\, we consider quantum bit-erasure in finite
  time and demonstrate significantly different work statistics for erasing 
 a classical bit of information versus a Haar random initial ensemble. Our 
 results indicate that coherence in the initial ensemble can be utilized as
  a resource for thermo- dynamic precision without incurring additional dis
 sipative work costs. We also obtain a generalized fluctuation theorem that
  establishes a new quantum lower bound on the mean dissipated work. This b
 ound\, counterintuitively\, is also applicable to a “classical” initia
 l ensemble with the same initial density matrix and is connected to quantu
 m absolute irreversibility.\n\nhttps://indico.fysik.su.se/event/9652/
LOCATION:A4:3001 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9652/
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