Quantum coherence of an orbital angular momentum multiplexed continuous-variable entangled state

TL;DR

This study experimentally measures and analyzes the robustness of quantum coherence in orbital angular momentum multiplexed continuous-variable entangled states under noisy conditions, highlighting their potential for quantum information processing.

Contribution

It provides the first experimental quantification of quantum coherence in OAM multiplexed CV entangled states and examines their evolution in noisy environments.

Findings

Quantum coherence of OAM multiplexed states matches that of Gaussian modes in noise.

Quantum coherence remains robust despite entanglement sudden death.

Results inform practical applications in noisy quantum information systems.

Abstract

Orbital angular momentum (OAM) multiplexed entangled state is an important quantum resource for high dimensional quantum information processing. In this paper, we experimentally quantify quantum coherence of OAM multiplexed continuous-variable (CV) entangled state and characterize its evolution in a noisy environment. We show that the quantum coherence of the OAM multiplexed CV entangled state carrying topological charges $l=1$ and $l=2$ are the same as that of the Gaussian mode with $l=0$ in a noisy channel. Furthermore, we show that the quantum coherence of OAM multiplexed entangled state is robust to noise, even though the sudden death of entanglement is observed. Our results provide reference for applying quantum coherence of OAM multiplexed CV entangled state in a noisy environment.