Experimental demonstration of robust quantum steering

TL;DR

This paper experimentally demonstrates quantum steering using entropy-based and dimension-bounded criteria, highlighting their robustness against experimental imperfections and potential for device-independent quantum applications.

Contribution

It introduces and compares entropy-based and dimension-bounded steering criteria, demonstrating their robustness and advantages under realistic experimental conditions.

Findings

Entropy-based criteria are robust against state preparation imperfections.

Dimension-bounded steering shows advantages with measurement imprecision.

Steering can be achieved with minimal assumptions, enabling more practical quantum tests.

Abstract

We analyse and experimentally demonstrate quantum steering using criteria based on generalised entropies and criteria with minimal assumptions based on the so-called dimension-bounded steering. Further, we investigate and compare their robustness against experimental imperfections such as misalignment in the shared measurement reference frame. Whilst entropy based criteria are robust against imperfections in state preparation, we demonstrate an advantage in dimension-bounded steering in the presence of measurement imprecision. As steering with such minimal assumptions is easier to reach than fully non-local correlations, and as our setting requires very little trust in the measurement devices, the results provide a candidate for the costly Bell tests while remaining highly device-independent.