Optimized network-steering inequality based on the distribution character of network parties
Phys. Rev. A 114, 022435 – Published 17 August, 2026
DOI: https://doi.org/10.1103/q32d-d296
Abstract
Network quantum steering characterizes the correlations among parties in a quantum network with different levels of trust. It is closely related to the distribution of trusted and untrusted parties, and can be detected by the violation of some steering inequalities. However, different methods of constructing inequality criteria result in varying degrees of capability to detect network steering using these inequalities. In this paper, we construct a class of network steering inequality criteria based on the distribution characteristics of network sources. They have been validated as superior to the existing network steering inequality criteria in Werner states or states. More importantly, they are applicable to a general network composed of two-qubit states. The existing network steering inequality criteria are only applicable to certain known fixed network structures.
