Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: Many-body Quantum Dynamics I (joint session DY/TT)

TT 19.6: Talk

Tuesday, March 18, 2025, 10:45–11:00, H37

Quantum Fisher information of monitored random circuits — •Arnau Lira Solanilla, Xhek Turkeshi, and Silvia Pappalardi — Universität zu Köln

We characterize the multipartite entanglement structure of monitored random quantum circuits using the quantum Fisher information. We show that, despite the known phase transition in bipartite correlations, the multipartiteness is bounded. On the other hand, we generate a phase with extensive multipartite entanglement under symmetry preserving random operations by introducing two-qubit measurements. We focus on the limit where no unitary operations are applied, but there is a competition between two noncommuting projective measurements. We exploit a map to bond percolation to precisely calculate the universal scaling of multipartite entanglement.

Keywords: Quantum Fisher Information; Measurement-induced phase transitions; Monitored Quantum Circuits; Multipartite entanglement