Fine-grained EPR-steering inequalities

TL;DR

This paper introduces a new fine-grained EPR-steering inequality that enhances detection of steerable states, relates to CHSH violation, and bounds quantum key distribution security.

Contribution

It presents a novel steering inequality based on fine-grained uncertainty, improving detection capabilities and linking violation levels to quantum key distribution security.

Findings

Detects all steerable two-qubit Werner states with minimal measurement settings

Pure entangled states are shown to be maximally steerable

Violation of the inequality bounds the key rate in quantum cryptography

Abstract

We derive a new steering inequality based on a fine-grained uncertainty relation to capture EPR-steering for bipartite systems. Our steering inequality improves over previously known ones since it can experimentally detect all steerable two-qubit Werner state with only two measurement settings on each side. According to our inequality, pure entangle states are maximally steerable. Moreover, by slightly changing the setting, we can express the amount of violation of our inequality as a function of their violation of the CHSH inequality. Finally, we prove that the amount of violation of our steering inequality is, up to a constant factor, a lower bound on the key rate of a one-sided device independent quantum key distribution protocol secure against individual attacks. To show this result, we first derive a monogamy relation for our steering inequality.