Quantum Information Seminar | May 28, 16:00
Probing prethermal many-body localized regime via rare measurements
Acting in unitary quantum evolution with projective measurements can fundamentally alter the quantum entanglement properties of a system, and a prominent example is the measurement-induced phase transition (MIPT) in systems governed by scrambling unitary dynamics, where a disentangled phase characterized by an area-law entanglement entropy (EE) emerges at high measurement rates. In this report, we show that the prethermal many-body localized regime becomes unstable against rare measurements, yielding an unusual enhancement of quantum entanglement, which is in stark contrast to the well-known disentangled effect of projective measurements. Through an unsupervised learning and mutual information analysis on the classical dataset of measurement outcomes, we find that the information loss in the system, reflected by the increased entanglement, is compensated by an emergent structure in this classical dataset. Our work paves the way to probe other nonergodic quantum phases of matter by subjecting rare measurements to the unitary dynamics.
Ausburg University
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Contact: Xhek Turkeshi