Interplays between classical and quantum entanglement-assisted communication scenarios

Abstract

Prepare-and-measure scenarios, in their many forms, can be seen as the basic building blocks of communication tasks. As such, they can be used to analyze a diversity of classical and quantum protocols -- of which dense coding and random access codes are key examples -- in a unified manner. In particular, the use of entanglement as a resource in prepare-and-measure scenarios have only recently started to be systematically investigated, and many crucial questions remain open. In this work, we explore such scenarios and provide answers to some seminal questions. More specifically, we show that, in scenarios where entanglement is a free resource, quantum messages are equivalent to classical ones with twice the capacity. We also prove that, in such scenarios, it is always advantageous for the parties to share entangled states of dimension greater than the transmitted message. Finally, we show that unsteerable states cannot provide advantages in classical communication tasks, thus proving that not all entangled states are useful resources in these scenarios.

7+7 pages, 2+0 figures

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• Observation of one-way Einstein-Podolsky-Rosen steering
• Device-independent tests of classical and quantum dimensions
• Semi-device-independent security of one-way quantum key distribution
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Cited by in corpus (7)

• Semidefinite programming relaxations for quantum correlations
• Information capacity of quantum communication under natural physical assumptions
• Certifying measurement incompatibility in prepare-and-measure and Bell scenarios
• Compression of Entanglement Improves Quantum Communication
• The role of entanglement in energy-restricted communication and randomness generation
• Semi-device-independent certification of number of measurements
• Quantum inputs in the prepare-and-measure scenario and stochastic teleportation