Active Quantum Matter from Monitored Pure-State Dynamics.

Authors

Jacob F Steiner, Felix von Oppen, Reinhold Egger

Published in

Physical review letters. Volume 137. Issue 12. Pages 120403. Sep 18, 2026.

Abstract

Quantum many-body systems coupled to out-of-equilibrium reservoirs can behave as active matter and exhibit signs of flocking. However, the resulting steady states are highly mixed and carry only weak quantum signatures. We show that signatures of active matter also arise in ensembles of pure states undergoing monitored quantum dynamics. We consider a spinful Luttinger liquid subject to measurement processes that shuffle spin-up particles to the left and spin-down particles to the right. For weak monitoring strengths and ferromagnetic spin interactions, we find power-law quantum correlations between spin density and charge current, which we identify as a hallmark of active quantum matter. The monitoring plays a dual role, generating the quantum active correlations for weak strengths while driving a Berezinskii-Kosterlitz-Thouless phase transition to a short-range correlated state at larger strengths.

PMID:
42826934
Bibliographic data and abstract were imported from PubMed on 03 Oct 2026.

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