Title: Measurement-enhanced entanglement in monitored superconductors Speaker:  Zhi-Yuan Wei (QuICS) Date & Time:  April 3, 2026, 12:00pm Where to Attend:  ATL 2400
Monitored quantum dynamics can exhibit entanglement phase transitions driven by the competition between unitary evolution and measurement. A common expectation is that LOCC measurements do not increase steady-state entanglement in such settings. We challenge this view by studying the dynamics of one-dimensional fermions (system size L) governed by a BCS Hamiltonian with gap Δ and subjected to on-site, spin-selective number measurements at rate p. Using exact Gaussian-state simulations and a quasiparticle analysis, we find that for Δ>0 the steady-state entanglement S increases with p over a finite interval 0 0 and small finite p, implying that the measurement-enhanced entanglement vanishes (i.e., p_th→0) in the thermodynamic limit.
Pizza and drinks will be served after the seminar in ATL 2117.