Author

Romain Vasseur

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Preprint Aug 2026

Theory of Measurement-Altered Criticality

Local measurements can alter long-range correlations in gapless quantum matter. We propose a theory of weakly-monitored Tomonaga-Luttinger liquids, a broad class of quantum critical states in one dimension. In order to address the intrinsic randomness of the measurement record, we develop a replica instanton calculatio...

Kabir Khanna, S. Murciano, Romain Vasseur · 1 citation

Preprint Aug 2026

Statistical Mechanics of Non-Abelian Learnability Transitions

Monitored many-body quantum systems can undergo sharp learnability transitions characterized by how much information can be learned by the observer. When the dynamics conserves a non-Abelian charge, such as an $SU(2)$ spin, understanding how the observer learns the total charge remains an outstanding problem. Unlike th...

R. Ma, Romain Vasseur · 0 citations

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