Scientific Calendar Event

Starts 8 Apr 2024 15:00
Ends 8 Apr 2024 16:00
Central European Time
Luigi Stasi Seminar Room (and via Zoom)

Felix von Oppen
(Freie Universität Berlin)

The quantum Ising model appears at the crossroads of many current developments in  condensed matter physics and quantum information. It is paradigmatic for symmetry breaking quantum phase transitions in its spin incarnation, for topological quantum phase transitions in its fermionized version, for lattice gauge theory as well as topological quantum error correcting codes in its dualized form, and for time crystals as a Floquet model. A recent experiment on a superconducting quantum processor shows that temporal spin-spin correlations can be remarkably robust against certain random fields. In this talk, I will describe our analysis of the effects of random fields on spectral pairings and spin-spin correlations, which reveals surprising differences between the various phases of the model. The robustness against random fields may be useful for quantum information processing.

(Work with Harald Schmid, Alexander-Georg Penner, Kang Yang, and Leonid Glazman)