# Demonstration of MultiSetting One-Way Einstein-Podolsky-Rosen Steering in Two-Qubit Systems

## TL;DR

This paper experimentally demonstrates one-way EPR steering in two-qubit systems with multiple measurement settings, highlighting its fundamental nature and potential for quantum information applications.

## Contribution

It provides the first experimental demonstration of genuine one-way EPR steering in the simplest two-qubit scenario with multiple measurement settings.

## Key findings

- One-way EPR steering persists even with infinite measurement settings.
- Steering radius effectively quantifies steerability.
- Experimental realization confirms theoretical predictions.

## Abstract

Einstein-Podolsky-Rosen (EPR) steering describes the ability of one party to remotely affect another's state through local measurements. One of the most distinguishable properties of EPR steering is its asymmetric aspect. Steering can work in one direction but fail in the opposite direction. This type of one-way steering, which is different from the symmetry concepts of entanglement and Bell nonlocality, has garnered much interest. However, an experimental demonstration of genuine EPR steering in the simplest scenario, i.e., one that employs two-qubit systems, is still lacking. In this work, we experimentally demonstrate one-way EPR steering with multimeasurement settings for a class of two-qubit states, which are still one-way steerable even with infinite settings. The steerability is quantified by the steering radius, which represents a necessary and sufficient steering criterion. The demonstrated one-way steering in the simplest bipartite quantum system is of fundamental interest and may provide potential applications in one-way quantum information tasks.