Remote Parameter Estimation in a Quantum Spin Chain Enhanced by Local Control
arXiv:1701.07399 · doi:10.1103/PhysRevA.95.052132
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.
7 pages, 3 figures