9 Quantum Discord and Nonclassical Correlations Beyond Entanglement

Gerardo Adesso Marco Cianciaruso and Thomas R. Bromley

University of Nottingham, Centre for the Mathematics and Theoretical Physics of Quantum Non‐Equilibrium Systems, School of Mathematical Sciences, University Park, Nottingham, NG7 2RD, UK

9.1 Introduction

What is quantum? As researchers of quantum physics, we are constantly bombarded with attributes such as “nonclassical” and “superclassical.” We strive to track down the elusive quantum–classical boundary, to understand what makes quantum mechanics so powerful yet counterintuitive. But for this purpose, we must first have a firm understanding of the classical world and the laws that classical mechanics imposes. ...

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