Multipartite steering verification with imprecise measurements

TL;DR

This paper introduces a robust method for verifying multipartite quantum steering and entanglement that accounts for measurement imprecision, improving reliability in practical quantum technology applications.

Contribution

The authors develop a quantitative verification method that eliminates false positives caused by measurement imprecision, advancing the robustness of quantum steering and entanglement verification.

Findings

Effective elimination of false positives due to measurement imprecision

Accurate delineation of valid multipartite steering verification

Verification of multipartite entanglement under nonideal conditions

Abstract

Quantum steering is a fundamental quantum correlation that plays a pivotal role in quantum technologies, but its verification crucially relies on precise measurements -- an assumption often undermined by practical imperfections. Here, we investigate multipartite steering verification under imprecise measurements and develop a quantitative method that effectively eliminates false positives induced by measurement imprecision. A comparison with a device-independent approach demonstrates that our method accurately delineates the scope of valid verification. In a special case, our method also enables the verification of multipartite entanglement under nonideal conditions. These results substantially enhance the robustness of multipartite steering and entanglement verification against measurement imprecision, thereby promoting their applicability in realistic quantum technologies.