Entanglement Trapping in Structured Environments

TL;DR

This paper investigates how structured environments like photonic band-gap materials can trap entanglement in two qubits, preventing sudden death and enabling entanglement preservation and manipulation for quantum information applications.

Contribution

It demonstrates the feasibility of entanglement trapping in realistic structured environments, highlighting potential for quantum control and information processing.

Findings

Entanglement trapping can prevent entanglement sudden death.

High entanglement trapping values are achievable in photonic band-gap materials.

Entanglement can be manipulated by Stark-shifting qubit frequencies.

Abstract

The entanglement dynamics of two independent qubits each embedded in a structured environment under conditions of inhibition of spontaneous emission is analyzed, showing entanglement trapping. We demonstrate that entanglement trapping can be used efficiently to prevent entanglement sudden death. For the case of realistic photonic band-gap materials, we show that high values of entanglement trapping can be achieved. This result is of both fundamental and applicative interest since it provides a physical situation where the entanglement can be preserved and manipulated, e.g. by Stark-shifting the qubit transition frequency outside and inside the gap.