Spatial versus sequential correlations for random access coding
Armin Tavakoli , Breno Marques , Marcin Pawłowski , Mohamed Bourennane
AbstractRandom 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. Remarkably, we show that the use of spatial and sequential quantum correlations imposes different limitations on the performance of quantum random access codes: Sequential correlations can outperform spatial correlations. We discuss the physics behind the observed discrepancy between spatial and sequential quantum correlations.
|Journal series||Physical Review A, ISSN 1050-2947, (A 35 pkt)|
|Publication size in sheets||0.5|
|Score|| = 35.0, 29-12-2017, ArticleFromJournal|
= 35.0, 29-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 2.925 (2) - 2016=2.716 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.