Information complementarity in quantum physics

TL;DR

This paper shows that information theory provides a more complete understanding of quantum complementarity than traditional observable-based approaches, supported by experimental tests on two-qubit states.

Contribution

It introduces the concept of information complementarity, experimentally tests it on two-qubit states, and explores information distribution in mixed states.

Findings

Experimental validation of information complementarity

Entanglement can increase while correlations decrease

Information distribution exhibits non-intuitive quantum properties

Abstract

We demonstrate that the concept of information offers a more complete description of complementarity than the traditional approach based on observables. We present the first experimental test of information complementarity for two-qubit pure states, achieving close agreement with theory; We also explore the distribution of information in a comprehensive range of mixed states. Our results highlight the strange and subtle properties of even the simplest quantum systems: for example, entanglement can be increased by reducing correlations between two subsystems.