Nonlocal quantum correlations under amplitude damping decoherence

TL;DR

This paper investigates how amplitude damping decoherence affects various nonlocal quantum correlations, revealing that entanglement, steering, and Bell nonlocality decay differently, with experimental validation of these phenomena.

Contribution

It provides a theoretical and experimental analysis of the differential robustness of quantum correlations under decoherence, highlighting their distinct operational implications.

Findings

All initial states exhibit sudden death of steering and Bell nonlocality.

Only some states show entanglement sudden death.

Environmental effects differ across quantum correlations.

Abstract

Different nonlocal quantum correlations of entanglement, steering and Bell nonlocality are defined with the help of local hidden state (LHS) and local hidden variable (LHV) models. Considering their unique roles in quantum information processing, it is of importance to understand the individual nonlocal quantum correlation as well as their relationship. Here, we investigate the effects of amplitude damping decoherence on different nonlocal quantum correlations. In particular, we have theoretically and experimentally shown that the entanglement sudden death phenomenon is distinct from those of steering and Bell nonlocality. In our scenario, we found that all the initial states present sudden death of steering and Bell nonlocality, while only some of the states show entanglement sudden death. These results suggest that the environmental effect can be different for different nonlocal quantum correlations, and thus, it provides distinct operational interpretations of different quantum correlations.