BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Billy Braasch (QuICS\, UMD) DTSTART:20240713T140000Z DTEND:20240713T160000Z DTSTAMP:20260423T011112Z UID:QMFNoT/56 DESCRIPTION:Title: Non-Abelian transport distinguishes three usually equivalent notions of en tropy production\nby Billy Braasch (QuICS\, UMD) as part of QM Foundat ions & Nature of Time seminar\n\n\nAbstract\nA fundamental challenge is to define quantum thermodynamic quantities—for example\, heat\, work\, and entropy production. We extend the definition of entropy production to a d eeply quantum regime involving noncommuting observables [1]. Consider two systems prepared in different thermal states. A unitary transports observa bles (“charges”) between the systems. Three common formulae model the entropy produced. They cast entropy as an extensive thermodynamic variable \, an information-theoretic uncertainty measure\, and a quantifier of irre versibility. Often\, the charges are assumed to commute with each other (e .g.\, energy and particle number)\, and the entropy-production formulae eq ual each other. Yet quantum charges can fail to commute\, inviting general izations of the three formulae. Charges’ noncommutation\, we find\, brea ks the formulae’s quivalence. Furthermore\, different formulae quantify different physical effects of charges’ noncommutation on entropy product ion. This work opens the door of stochastic thermodynamics to charges that are peculiarly quantum by failing to commute with each other.\n LOCATION:https://researchseminars.org/talk/QMFNoT/56/ END:VEVENT END:VCALENDAR