Measurement-Induced Quantum Synchronization and Multiplexing

TL;DR

This paper demonstrates that continuous measurements can induce a transition to stable quantum synchronization in many-body systems, revealing nonclassical synchronization phenomena and a form of quantum multiplexing.

Contribution

It introduces criteria for measurement-induced quantum synchronization, shows control over synchronized realizations, and presents a novel quantum multiplexing concept exploiting superpositions.

Findings

Quantum measurements can induce stable synchronization in many-body systems.

Synchronization can be controlled from none to all realizations.

Measurement-induced synchronization is a nonclassical phenomenon exploiting superpositions.

Abstract

Measurements are able to fundamentally affect quantum dynamics. We here show that a continuously measured quantum many-body system can undergo a spontaneous transition from asynchronous stochastic dynamics to noise-free stable synchronization at the level of single trajectories. We formulate general criteria for this quantum phenomenon to occur, and demonstrate that the number of synchronized realizations can be controlled from none to all. We additionally find that ergodicity is typically broken, since time and ensemble averages may exhibit radically different synchronization behavior. We further introduce a quantum type of multiplexing that involves individual trajectories with distinct synchronization frequencies. Measurement-induced synchronization appears as a genuine nonclassical form of synchrony that exploits quantum superpositions.