Quantum Synchronization and Dissipative Quantum Sensing

TL;DR

This paper links quantum synchronization with quantum metrology, proposing a framework where quantum Fisher information measures synchronization and guides optimal drive selection, with implications for quantum sensing technologies.

Contribution

It introduces a quantum metrology-based framework for characterizing quantum synchronization using quantum Fisher information, including multi-drive scenarios and optimization methods.

Findings

Quantum Fisher information quantifies quantum synchronization.

QFI matrix identifies optimal drives for synchronization.

Multiple drives induce distinguishable synchronization responses.

Abstract

We study the phenomenon of quantum synchronization from the viewpoint of quantum metrology. By interpreting quantum self-sustained oscillators as dissipative quantum sensors, we develop a framework to characterize several aspects of quantum synchronization. We show that the quantum Fisher information (QFI) serves as a system-agnostic measure of quantum synchronization that also carries a clear operational meaning, viz., it quantifies the precision with which the amplitude of a weak synchronizing drive can be measured. We extend our analysis to study many-body oscillators subjected to multiple drives. We show how the QFI matrix can be used to determine the optimal drive that maximizes quantum synchronization, and also to quantitatively differentiate the synchronization responses induced by different drives. Our work highlights multiple connections between quantum synchronization and quantum metrology, paving a route towards finding quantum technological applications of quantum synchronization.