Quantum parameter estimation in a dissipative environment

TL;DR

This paper explores how non-Markovian effects and specific probe-environment interactions can enhance quantum parameter estimation accuracy in dissipative environments, challenging traditional weak-coupling assumptions.

Contribution

It provides an exact numerical analysis of quantum estimation beyond weak-coupling and RWA, showing how environment engineering improves precision.

Findings

Non-Markovianity boosts estimation performance.

Perpendicular probe-environment interaction enhances precision.

Optimal decoherence engineering can improve quantum sensing.

Abstract

We investigate the performance of quantum parameter estimation based on a qubit probe in a dissipative bosonic environment beyond the traditional paradigm of weak-coupling and rotating-wave approximations. By making use of an exactly numerical hierarchical equations of motion method, we analyze the influences of the non-Markovian memory effect induced by the environment and the form of probe-environment interaction on the estimation precision. It is found that (i) the non-Markovianity can effectively boost the estimation performance and (ii) the estimation precision can be improved by introducing a perpendicular probe-environment interaction. Our results indicate the scheme of parameter estimation in a noisy environment can be optimized via engineering the decoherence mechanism.