Conditional Mutual Information and Quantum Steering

Understand

Quantum steering has recently been formalized in the framework of a resource theory of steering, and several quantifiers have already been introduced.

• Here, we propose an information-theoretic quantifier for steering called intrinsic steerability, which uses conditional mutual information to measure the deviation of a given assemblage from one having a local hidden-state model.
• We thus relate conditional mutual information to quantum steering and introduce monotones that satisfy certain desirable properties.
• The idea behind the quantifier is to suppress the correlations that can be explained by an inaccessible quantum system and then quantify the remaining intrinsic correlations.