Investigating an approach of robustly self-testing two-qubit entangled states

TL;DR

This paper applies a recent framework for robust self-testing to two-qubit entangled states, providing new fidelity bounds and comparing them with existing methods.

Contribution

It introduces a novel application of a recent self-testing framework specifically to two-qubit entangled states, enhancing robustness and fidelity estimation.

Findings

New bounds on fidelity with reference states

Comparison shows improved robustness over previous methods

Demonstrates effectiveness of the framework in practical scenarios

Abstract

In a recent paper [Quantum 5, 552 (2021)], the authors proposed a framework for robustly self-testing steerable quantum assemblages. In this work, we apply their method to the scenario of self-testing two-qubit entangled quantum states. The new bounds on the fidelity with the reference states are compared with other methods.