Entanglement generation in quantum networks of Bose-Einstein condensates

TL;DR

This paper proposes a scheme to generate entanglement and transfer quantum states between macroscopic Bose-Einstein condensate qubits in a quantum network using coupled cavities and optical fibers.

Contribution

It introduces a novel method for entangling and transferring quantum information between large-scale BEC-based qubits in a network setting.

Findings

Entanglement can be generated between BEC nodes using the proposed cavity-fiber scheme.

Quantum state transfer between BEC nodes is feasible with high fidelity.

The scheme offers a pathway for scalable quantum networks with macroscopic quantum systems.

Abstract

Two component (spinor) Bose-Einstein condensates (BECs) are considered as the nodes of an interconnected quantum network. Unlike standard single-system qubits, in a BEC the quantum information is duplicated in a large number of identical bosonic particles, thus can be considered to be a "macroscopic" qubit. One of the difficulties with such a system is how to effectively interact such qubits together in order to transfer quantum information and create entanglement. Here we propose a scheme of cavities containing spinor BECs coupled by optical fiber in order to achieve this task. We discuss entanglement generation and quantum state transfer between nodes using such macroscopic BEC qubits.