Entanglement robustness via spatial deformation of identical particle wave functions

TL;DR

This paper demonstrates that deforming the wave functions of identical qubits to increase their spatial indistinguishability can help recover entanglement degraded by environmental noise, enhancing quantum correlation preservation.

Contribution

It introduces a novel method of using spatial wave function deformation to protect and recover entanglement in noisy environments for identical particles.

Findings

Spatial deformation increases entanglement recovery.

Higher indistinguishability leads to more entanglement preservation.

Method effective across various noise models.

Abstract

We address the problem of entanglement protection against surrounding noise by a procedure suitably exploiting spatial indistinguishability of identical subsystems. To this purpose, we take two initially separated and entangled identical qubits interacting with two independent noisy environments. Three typical models of environments are considered: amplitude damping channel, phase damping channel and depolarizing channel. After the interaction, we deform the wave functions of the two qubits to make them spatially overlap before performing spatially localized operations and classical communication (sLOCC) and eventually computing the entanglement of the resulting state. This way, we show that spatial indistinguishability of identical qubits can be utilized within the sLOCC operational framework to partially recover the quantum correlations spoiled by the environment. A general behavior emerges: the higher the spatial indistinguishability achieved via deformation, the larger the amount of recovered entanglement.