Nonlocal quantum memory effects in a correlated multimode field

TL;DR

This paper reviews a model where two qubits interact with a nonlocally correlated environment, revealing significant nonlocal memory effects under specific initial conditions, advancing understanding of quantum memory dynamics.

Contribution

It derives accurate reduced dynamics for two qubits coupled to a correlated multimode field, highlighting the presence of strong nonlocal memory effects with particular initial states.

Findings

Strong nonlocal memory effects occur with suitable initial environmental states.

Corrected expressions for the two-qubit reduced dynamics are provided.

Nonlocal correlations influence quantum memory behavior significantly.

Abstract

We review the model of two qubits coupled locally to an environment which consists of nonlocally correlated field modes [Phys. Rev.Lett. 108, 210402 (2012)]. We derive the correct expressions for the reduced dynamics of the two-qubit system and demonstrate that strong nonlocal memory effects are indeed present for suitable initial EPR-type Gaussian environmental states.