Remote parameter estimation in a quantum spin chain enhanced by local control
Jukka Kiukas, Kazuya Yuasa, Daniel Klaus Burgarth · Physical Review A · 2017
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.