The transfer of nonlocality between two- and three-qubit dissipative systems with counter-rotating-wave terms

TL;DR

This paper explores how counter-rotating-wave terms influence nonlocality and entanglement in three-qubit systems coupled to a common bath, revealing accelerated decay, transfer phenomena, and enhanced nonlocality beyond traditional approximations.

Contribution

It demonstrates the effects of counter-rotating-wave terms on nonlocality transfer and genuine tripartite correlations in three-qubit systems beyond standard approximations.

Findings

Counter-rotating terms accelerate decay of three-party correlations in strong coupling.

Nonlocality transfers between three-qubit and subsystems in ultrastrong coupling.

Counter-rotating terms enhance genuine tripartite nonlocality.

Abstract

We investigate the effect of counter-rotating-wave terms on nonlocality and entanglement for three qubits coupled with a common bath for strong and ultrastrong coupling regimes beyond the traditional treatment of Born-Markovian, perturbative and rotating wave approximations by employing the numerical hierarchical equations of motion approach. Our findings are as follows: (i) In the strong coupling regime, the counter-rotating terms accelerate the decay of genuine three-party correlations, and the obvious sudden birth of BN is found; (ii) In the ultrastrong coupling regime, we observe a novel phenomenon where nonlocality is consistently transferred between a three-qubit and its subsystem. Besides, the inclusion of counter-rotating wave terms obviously enhances genuine tripartite nonlocality; and (iii) These counter-rotating terms cannot effectively generate genuine three-party correlations in zero-excitation cases, which differs from previous studies involving only two qubits.