Work

Quantum metrology with nonequilibrium steady states of quantum spin chains

Year: 2014

Type: article

Abstract: We consider parameter estimations with probes being the boundary-driven or dissipated nonequilibrium steady states of $XXZ$ spin-$1/2$ chains. The parameters to be estimated are the dissipation coupling and the anisotropy of the spin-spin interaction. In the weak-coupling regime we compute the scaling of the Fisher information, i.e., the inverse best sensitivity among all estimators, with the number of spins. We find superlinear scalings and transitions between the distinct isotropic and anisotropic phases. We also look at the best relative error, which decreases with the number of particles faster than the shot-noise only for the estimation of anisotropy.

Source: Physical Review A

DOI: 10.1103/physreva.90.062130

Authors: Ugo Marzolino, Tomaž Prosen

Institution: University of Ljubljana

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Javna Agencija za Raziskovalno Dejavnost RS

Awards: Integrabilnost in ergodična teorija neravnovesnih mnogodelčnih kvantnih sistemov (Slovene), Solid state theory and statistical physics