Semidefinite relaxations for high-dimensional entanglement in the steering scenario

TL;DR

This paper develops semidefinite programming hierarchies to efficiently benchmark high-dimensional entanglement and fidelity in quantum steering scenarios, enabling practical analysis of experimental quantum systems.

Contribution

It introduces computationally efficient methods for entanglement dimensionality detection and fidelity estimation in high-dimensional quantum steering.

Findings

Methods are computationally independent of Schmidt number.

Techniques can analyze experimental high-dimensional quantum systems.

Approaches are practical for experimental implementation.

Abstract

We introduce semidefinite programming hierarchies for benchmarking relevant entanglement properties in the high-dimensional steering scenario. Firstly, we provide a general method for detecting the entanglement dimensionality through certification of the Schmidt number. Its key feature is that the computational cost is independent of the Schmidt number under consideration. Secondly, we provide a method to estimate the fidelity of the source with any maximally entangled state. Using only basic computational means, we demonstrate the usefulness of these methods, which can be directly used to analyse experiments on high-dimensional systems.