Author

Andreas W. W. Ludwig

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Preprint Aug 2026

Universal crossovers in weakly-monitored quantum critical states

We study post-measurement ensembles of ground states of tricritical and critical 1D quantum Ising Hamiltonians subjected, respectively, to weak energy and spin measurements without post-selection. These measurements act as relevant perturbations about the unmeasured critical ground states. Using finite-size renormaliza...

Abhishek Kumar, Rushikesh A. Patil, Andreas W. W. Ludwig et al. · 3 citations

Preprint Aug 2026

Learning Potts Models and $Z_3$ Toric Codes: Higher and Ordinary Nishimori Criticality

Motivated by a previous Ising study, we identify a ${\it higher}$ Nishimori line in the learning phase diagram of the $2D$ $q$-state Potts model $(2<q\leq 4)$ under bond-energy measurements. This ${\it higher}$ Nishimori line meets the critical temperature line of the Potts model, in a ${\it higher}$ Nishimori critical...

Rushikesh A. Patil, M. Pütz, Rohit Mukherjee et al. · 0 citations