Free-Fermion Measurement-Induced Volume- to Area-Law Entanglement Transition in the Presence of Fermion Interactions

• URL: http://arxiv.org/abs/2510.23706v1
• Date: Mon, 27 Oct 2025 18:00:02 GMT
• Title: Free-Fermion Measurement-Induced Volume- to Area-Law Entanglement Transition in the Presence of Fermion Interactions
• Abstract summary: At a generic volume- to area-law entanglement transition in a many-body system, quantum chaos is arrested.<n>We argue that this tends to imply the vanishing of a certain "mass" term in the field theory of the measurement-induced phase transition.<n>We conjecture that the MIPT is the noninteracting DIII one in this case; the volume-law phase arises through the dangerously irrelevant mass.
• Score: 3.3597894252215297
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: At a generic volume- to area-law entanglement transition in a many-body system, quantum chaos is arrested. We argue that this tends to imply the vanishing of a certain "mass" term in the field theory of the measurement-induced phase transition (MIPT) for monitored, interacting fermions. To explore this idea, we consider the MIPT with no conserved quantities that describes 1D monitored, interacting Majorana fermions in class DIII. We conjecture that the MIPT is the noninteracting DIII one in this case; the volume-law phase arises through the dangerously irrelevant mass. We propose numerical tests of our conjecture and analytically identify a candidate noninteracting critical point.

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