Guccione Giovanni, Darras Tom, Le Jeannic Hanna, Verma Varun B, Nam Sae Woo, Cavaillès Adrien, Laurat Julien
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Universite PSL, Collège de France, 4 Place Jussieu, 75005 Paris, France.
National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.
Sci Adv. 2020 May 29;6(22). doi: 10.1126/sciadv.aba4508. Print 2020 May.
Recent advances in quantum technologies are rapidly stimulating the building of quantum networks. With the parallel development of multiple physical platforms and different types of encodings, a challenge for present and future networks is to uphold a heterogeneous structure for full functionality and therefore support modular systems that are not necessarily compatible with one another. Central to this endeavor is the capability to distribute and interconnect optical entangled states relying on different discrete and continuous quantum variables. Here, we report an entanglement swapping protocol connecting such entangled states. We generate single-photon entanglement and hybrid entanglement between particle- and wave-like optical qubits and then demonstrate the heralded creation of hybrid entanglement at a distance by using a specific Bell-state measurement. This ability opens up the prospect of connecting heterogeneous nodes of a network, with the promise of increased integration and novel functionalities.
量子技术的最新进展正在迅速推动量子网络的构建。随着多个物理平台和不同类型编码的并行发展，当前和未来网络面临的一个挑战是维持异构结构以实现完整功能，从而支持不一定相互兼容的模块化系统。这一努力的核心是能够分发和互连依赖于不同离散和连续量子变量的光学纠缠态。在此，我们报告了一种连接此类纠缠态的纠缠交换协议。我们在类粒子和类波光学量子比特之间生成单光子纠缠和混合纠缠，然后通过特定的贝尔态测量展示了远程混合纠缠的预示创建。这种能力为连接网络的异构节点开辟了前景，有望实现更高的集成度和新颖的功能。
