Quantum Discord and Entanglement of Quasi-Werner States based on Entangled Coherent States

TL;DR

This paper compares quantum discord and entanglement in Werner states formed from entangled coherent states, highlighting differences between maximally and non-maximally ECS-based states and their dependence on parameters.

Contribution

It introduces a comparison of quantum discord and entanglement in quasi-Werner states based on entangled coherent states, including their parameter dependencies.

Findings

Maximally ECS-based Werner states are equivalent to perfect Werner states.

Non-maximally ECS-based quasi-Werner states show parameter-dependent quantum correlations.

Quantum discord and entanglement vary with coherent amplitude and measurement basis.

Abstract

Present work is an attempt to compare quantum discord and quantum entanglement of Werner states formed with the four bipartite entangled coherent states (ECS) used recently for quantum teleportation of a qubit encoded in superposed coherent state. Out of these, two based on maximally ECS are exactly similar to the perfect Werner state, while the rest two, based on non-maximally ECS, which are called quasi-Werner states behave in somewhat different ways and their quantum discord and entanglement depends on the coherent amplitude and the measurement basis.