Spatial versus Sequential Correlations for Random Access Coding

Understand

Random access codes are important for a wide range of applications in quantum information.

• However, their implementation with quantum theory can be made in two very different ways: (i) by distributing data with strong spatial correlations violating a Bell inequality, or (ii) using quantum communication channels to create stronger-than-classical sequential correlations between state preparation and measurement outcome.
• Here, we study this duality of the quantum realization.
• We present a family of Bell inequalities tailored to the task at hand and study their quantum violations.