BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Brian Skinner (Ohio State UNiversity) DTSTART:20201014T171500Z DTEND:20201014T184500Z DTSTAMP:20260423T021404Z UID:VSFLRC/1 DESCRIPTION:Title: M easurement-induced Phase Transitions in the Dynamics of Quantum Entangleme nt\nby Brian Skinner (Ohio State UNiversity) as part of VSF Long Range Colloquium\n\n\nAbstract\nWhen a quantum system evolves under unitary dyn amics\, as produced by either a Hamiltonian or by a sequence of quantum ga tes\, its various component parts tend to become more entangled with each other. Making measurements\, on the other hand\, tends to reduce this enta nglement by collapsing some of the system's degrees of freedom. In this ta lk we explore what happens to the entanglement when a quantum many-body sy stem undergoes both unitary evolution and sporadic measurements. We show t hat the competition between these two effects leads to a new kind of dynam ical phase transition\, such that when the measurement rate is lower than a critical value the dynamics is "entangling"\, while a higher-than-critic al measurement rate leads to a "disentangling" phase. We study this transi tion both in one-dimensional spin chains and in "all-to-all" coupled syste ms\, for which unitary operators can directly couple any two degrees of fr eedom. In both cases the qualitative features of the transition can be und erstood by mapping to a problem of classical percolation\, and in the all- to-all case some features of the transition can be understood exactly.\n LOCATION:https://researchseminars.org/talk/VSFLRC/1/ END:VEVENT END:VCALENDAR