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:0-1121@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20260609T110000 DTEND;TZID=Europe/Paris:20260609T120000 DTSTAMP:20260520T100401Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/lptms-seminar-ole g-evnin-chulalongkorn-university-bangkok/ SUMMARY:LPTMS Seminar: Oleg Evnin (Chulalongkorn University\, Bangkok) - Sa lle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 9 Juin 26 11:00 DESCRIPTION:Krylov and Nielsen complexity\nOleg Evnin (Chulalongkorn Univer sity\, Bangkok)\n \;\n\nSciPost Phys. 13 (2022) 090\nSciPost Phys. 16 (2024) 041\nPhys. Rev. Lett. 132 (2024) 160402\nPhys. Rev. Lett. 134 (2025 ) 050402\n\nRecent years have seen a surge of interest in developing measu res of complexity for the unitary evolution in quantum mechanics. One appr oach\, known as Nielsen complexity\, visualizes the evolution as a continu ous "program" executed by the system and applies measures developed in com putational complexity theory to judge whether the unitary evolution operat ors are simple or complex. Another approach\, known as Krylov complexity\, tracks how rapidly quantum states and operators spread over different ind ependent directions as they evolve. One key question is whether these quan tities are capable of distinguishing the evolution operators of solvable ( simple) systems from generic (chaotic\, complicated) ones. I will describe the challenges and achievements within this line of pursuit\, as well as interrelations between the two apparently different approaches.\n\n \; 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:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR