Nonclassical correlations in decaying systems

TL;DR

This paper demonstrates that quantum decaying systems exhibit nonclassical correlations detectable through weak measurements, violating classical bounds and highlighting their potential as quantum resources.

Contribution

It reveals the nonclassical behavior of decaying systems via weak measurements and connects this to their incompatibility with classical decay models.

Findings

Violations of classical bounds observed in weak measurement correlations

Incompatibility between exponential decay and unitary evolution identified

Experimental feasibility shown through continuous weak measurements

Abstract

A quantum decaying system can reveal its nonclassical behavior by being noninvasively measured. Correlations of weak measurements in the noninvasive limit violate the classical bound for a universal class of systems. The violation is related to the incompatibility between exponential decay and unitary evolution. The phenomenon can be experimentally observed by continuous weak measurements and a large class of observables. The nonclassical nature of such a system allows us to treat it as a potential quantum resource.