Measuring network quantum steerability utilizing artificial neural networks

TL;DR

This paper introduces a neural network-based approach for measuring network quantum steerability, offering a versatile and accurate tool applicable to various quantum network scenarios, including bipartite, multipartite, and bilocal configurations.

Contribution

The authors develop a novel neural network method for quantifying network quantum steerability, capable of generalization and demonstrating high accuracy across different quantum network scenarios.

Findings

Method achieves high accuracy in standard steering scenarios

Numerical results align with established findings

Analytical derivation of steering thresholds in bilocal networks

Abstract

Network quantum steering plays a pivotal role in quantum information science, enabling robust certification of quantum correlations in scenarios with asymmetric trust assumptions among network parties. The intricate nature of quantum networks, however, poses significant challenges for the detection and quantification of steering. In this work, we develop a neural network-based method for measuring network quantum steerability, which can be generalized to arbitrary quantum networks and naturally applied to standard steering scenarios. Our method provides an effective framework for steerability analysis, demonstrating remarkable accuracy and efficiency in standard bipartite and multipartite steering scenarios. Numerical simulations involving isotropic states and noisy GHZ states yield results that are consistent with established findings in these respective scenarios. Furthermore, we demonstrate its utility in the bilocal network steering scenario, where an untrusted central party shares two-qubit isotropic states of different visibilities, $\nu$ and $\omega$, with trusted endpoint parties and performs a single Bell state measurement. Through explicit construction of a network local hidden state model derived from numerical results and incorporation of the entanglement properties of network assemblages, we analytically demonstrate that the network steering thresholds are determined by the curve $\nu \omega = {1}/{3}$ under the corresponding configuration.