Swapped Entanglement in High-Dimensional Quantum Systems

TL;DR

This paper extends entanglement swapping to high-dimensional quantum systems (qudits), analyzes its dynamics, and demonstrates enhanced entanglement distribution capabilities compared to qubit systems, with applications in quantum teleportation and repeaters.

Contribution

It introduces the concept of entanglement swapping for qudits, analyzes its dynamics, and discusses its robustness in noisy systems, advancing high-dimensional quantum communication.

Findings

Higher-dimensional systems enable better entanglement distribution.

Entanglement swapping in qudits is effective even in noisy conditions.

Enhanced teleportation capabilities with qudits compared to qubits.

Abstract

Entanglement swapping is a fundamental protocol in quantum information processing that enables the distribution of entanglement between distant quantum systems. In this work, we first extend the concept of entanglement swapping to higher-dimensional quantum systems, specifically qudits. We then analyze the dynamics of entanglement swapping and quantify the average swapped entanglement in terms of concurrence and negativity. Our results demonstrate that higher-dimensional systems offer enhanced entanglement distribution capabilities compared to qubit-based protocols. We also discuss the application of entangled qudits in terms of long-distance teleportation that provides the base for quantum repeaters. Furthermore, we discuss the entanglement swapping for a real and noisy system. The behaviors of entanglement against fidelity with different dimensions are also discussed.