BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:0-1028@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20250328T134500 DTEND;TZID=Europe/Paris:20250328T151500 DTSTAMP:20250318T162315Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/informal-quantum- seminar-du-lptms-giuseppe-di-giulio-stockholm-university/ SUMMARY:Informal Quantum Seminar du LPTMS: Giuseppe Di Giulio (Stockholm Un iversity) - Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n °530 - 28 Mar 25 13:45 DESCRIPTION:Local Quenches from a Krylov Perspective\nGiuseppe Di Giulio (S tockholm University)\n \;\n\nIn the last few years\, quantifying the c omplexity of quantum states has found applications in many fields\, includ ing quantum information and computing\, quantum dynamics in many-body syst ems\, and black hole physics. Among these measures\, the spread complexity roughly quantifies the size of the space of states visited along quantum dynamics. It is obtained through Krylov space methods\, which consist of p rojecting the evolution of a state onto one-dimensional dynamics. In this talk\, I will discuss the evolution of the spread complexity after a local quantum quench in conformal field theories (CFT). Interestingly\, this qu antity depends on the central charge of the considered theory. I will also show that\, to get rid of all the non-universal contributions in the lead ing time behaviour\, it is convenient to study another Krylov space quanti ty\, the K-entropy\, an entropy measure defined for pure states without th e need for a bipartition. These results support the usefulness of the Kryl ov space methods to study quantum dynamics CATEGORIES:seminars LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53 0\, rue André Riviere\, Orsay\, 91405\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\ , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:STANDARD DTSTART:20241027T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET END:STANDARD END:VTIMEZONE END:VCALENDAR