Remote control of quantum correlations in two-qubit receiver via three-qubit sender

TL;DR

This paper investigates how to remotely control quantum correlations, specifically discord, in a two-qubit receiver by adjusting the initial state of a three-qubit sender through an inhomogeneous spin chain.

Contribution

It introduces two parameters to characterize creatable quantum correlations and analyzes their dependence on the inhomogeneity of the spin chain.

Findings

Discord between receiver and chain can be controlled via sender parameters.

Internal discord within the receiver depends on chain inhomogeneity.

Proposes a method for remote quantum correlation control.

Abstract

We study the problem of remote control of quantum correlations (discord) in a sub-system of two qubits (receiver) via the parameters of the initial state of another sub-system of three qubits (sender) connected with the receiver by the inhomogeneous spin-1/2 chain. We propose two parameters characterizing the creatable correlations. The first one is the discord between the receiver and the rest of spin-1/2 chain, it concerns the mutual correlations between these two subsystems. The second parameter is the discord between the two nodes of the receiver and describes the correlations inside of the receiver. We study the dependence of these two discords on the inhomogeneity degree of spin chain.