Local-channel-induced rise of quantum correlations in continuous-variable systems

TL;DR

This paper demonstrates that in continuous-variable bipartite systems, local dissipative channels can induce an initial increase in quantum correlations, specifically Gaussian quantum discord, contrary to the usual decay expected from such channels.

Contribution

It extends the phenomenon of local-induced quantum correlation rise from qubits to continuous-variable systems, analyzing Gaussian states under Markovian channels.

Findings

Quantum discord can initially increase under local thermal-noise channels.

The phenomenon is observed in two-mode squeezed thermal states.

Local dissipation can enhance quantum correlations temporarily.

Abstract

It was recently discovered that the quantum correlations of a pair of disentangled qubits, as measured by the quantum discord, can increase solely because of their interaction with a local dissipative bath. Here, we show that a similar phenomenon can occur in continuous-variable bipartite systems. To this aim, we consider a class of two-mode squeezed thermal states and study the behavior of Gaussian quantum discord under various local Markovian non-unitary channels. While these in general cause a monotonic drop of quantum correlations, an initial rise can take place with a thermal-noise channel.