Continuous variable multipartite vibrational entanglement

TL;DR

This paper proposes a scheme to generate and analyze long-lived, multipartite continuous-variable entanglement among vibrational modes of a mechanical resonator, with potential applications in quantum technologies.

Contribution

It introduces a compact method to create scalable, noise-resilient multipartite entanglement in vibrational modes via a driven two-level system, advancing CV quantum resource development.

Findings

Demonstrates multipartite entanglement in a three-mode system.

Shows robustness of entanglement against noise and thermal effects.

Provides an effective model for scalable multimode entanglement.

Abstract

A compact scheme for the preparation of macroscopic multipartite entanglement is proposed and analyzed. In this scheme the vibrational modes of a mechanical resonator constitute continuous variable (CV) subsystems that entangle to each other as a result of their interaction with a two-level system (TLS). By properly driving the TLS, we show that a selected set of modes can be activated and prepared in a multipartite entangled state. We first study entanglement properties of a three-mode system by evaluating the genuine multipartite entanglement. And investigate its usefulness as a quantum resource by computing the quantum Fisher information. Moreover, the robustness of the state against the qubit and thermal noises is studied, proving a long-lived entanglement. To examine the scalability and structural properties of the scheme, we derive an effective model for the multimode system through elimination of the TLS dynamics. This work provides a step towards a compact and versatile device for creating multipartite noise-resilient entangled state in vibrational modes as a resource for CV quantum metrology, quantum communication, and quantum computation.