SAMOP 2021 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 3: Quantum Information and Foundations I

QI 3.5: Vortrag

Montag, 20. September 2021, 15:30–15:45, H4

Measurement classicality in the prepare and measure scenario — •Carlos de Gois¹, George Moreno², Ranieri Nery², Samuraí Brito², Rafael Chaves², and Rafael Rabelo¹ — ¹``Gleb Wataghin'' Physics Institute, University of Campinas — ²International Institute of Physics, Federal University of Rio Grande do Norte

Quantum communication is expected to become a widespread technology. In that regard, dense coding, random access coding, and quantum key distribution are some of the most outstanding communication protocols where quantum systems provide advantage over their classical counterparts. These will arguably be building blocks for the so-called quantum internet, and recent experiments prove they are feasible in practice. Prepare and measure scenarios --- the central theme in this presentation --- are a useful abstraction within which a common basis for many such protocols can be found. In these scenarios, an objective of primal importance is determining which preparations and measurements can or cannot lead to nonclassical behaviors, and what are the quantum features that enable nonclassicality to happen. Focusing on the measurements, we provide a general method that can certify, through a sufficient condition, if a given set of measurements are classical (i.e., they never lead to nonclassicality), no matter what quantum preparations they may act upon. As an application, we demonstrate the existence of a large set of incompatible measurements that are nevertheless classical, thus showing incompatibility is insufficient for nonclassicality in the prepare and measure scenario.

Ref.: PRX Quantum 2, 030311 (2021)