# Remote Parameter Estimation in a Quantum Spin Chain Enhanced by Local Control

## TL;DR

This paper investigates how local control on a qubit probe can significantly enhance parameter estimation in a quantum spin chain, revealing connections to quantum state transfer.

## Contribution

It demonstrates that local control on a probe qubit improves estimation accuracy and uncovers links to quantum state transfer in spin chains.

## Key findings

- Control improves estimation performance
- Connections to quantum state transfer are identified
- Potential for enhanced quantum sensing applications

## Abstract

We study the interplay of control and parameter estimation on a quantum spin chain. A single qubit probe is attached to one end of the chain, while we wish to estimate a parameter on the other end. We find that control on the probe qubit can substantially improve the estimation performance and discover some interesting connections to quantum state transfer.