Dynamics of spatially indistinguishable particles and entanglement protection

TL;DR

This paper introduces a universal framework for analyzing the dynamics of indistinguishable particles coupled to environments, demonstrating how spatial indistinguishability can protect quantum entanglement from noise.

Contribution

The authors develop a general, universal method to describe the dynamics of indistinguishable particles under various interactions, highlighting entanglement protection due to spatial indistinguishability.

Findings

Spatial indistinguishability protects entanglement against noise.

Framework applies to both bosons and fermions.

Effective for various Markovian noise models.

Abstract

We provide a general framework which allows one to obtain the dynamics of $N$ noninteracting spatially indistinguishable particles locally coupled to separated environments. The approach is universal, being valid for both bosons and fermions and for any type of system-environment interaction. It is then applied to study the dynamics of two identical qubits under paradigmatic Markovian noises, such as phase damping, depolarizing and amplitude damping. We find that spatial indistinguishability of identical qubits is a controllable intrinsic property of the system which protects quantum entanglement against detrimental noise.