Dissipative quantum metrology in manybody systems of identical particles

TL;DR

This paper explores how entanglement generated in dissipative open quantum systems of identical particles can enhance parameter estimation, potentially surpassing classical limits even in Markovian dynamics at short times.

Contribution

It demonstrates that dissipative quantum systems can produce useful entanglement for metrology, extending quantum advantage to open, many-body systems.

Findings

Entanglement can improve estimation precision in dissipative systems.

Short-time dynamics allow surpassing the classical shot-noise limit.

Markovian dissipation does not preclude quantum metrological advantage.

Abstract

Estimation of physical parameters is a must in almost any part of science and technology. The enhancement of the performances in this task, e.g., beating the standard classical shot-noise limit, using available physical resources is a major goal in metrology. Quantum metrology in closed systems has indicated that entanglement in such systems may be a useful resource. However, it is not yet fully understood whether in open quantum systems such enhancements may still show up. Here, we consider a dissipative (open) quantum system of identical particles in which a parameter of the open dynamics itself is to be estimated. We employ a recently-developed dissipative quantum metrology framework, and investigate whether the entanglement produced in the course of the dissipative dynamics may help the estimation task. Specifically, we show that even in a Markovian dynamics, in which states become less distinguishable in time, at small enough times entanglement generated by the dynamics may offer some advantage over the classical shot-noise limit.