A photonic entanglement filter with Rydberg atoms
A photonic entanglement filter with Rydberg atoms
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DOI：
10.1038/s41566-023-01194-0
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发表时间：
2022-09
期刊：
影响因子：
35
通讯作者：
Gen-Sheng Ye;Biao Xu;Yue Chang;Shuai Shi;T. Shi;Lin Li
中科院分区：
文献类型：
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作者：
Gen-Sheng Ye;Biao Xu;Yue Chang;Shuai Shi;T. Shi;Lin Li
能够确定地操纵光子纠缠的设备至关重要，因为光子是量子信息的理想信使。然而，由于光子的非相互作用性质，许多光子量子操作只能用概率线性光学方法来演示，这导致了巨大的资源开销和较差的可扩展性。在这里，我们报道了一种新型的纠缠滤光片，它可以传输所需的光子纠缠态，并阻止不想要的纠缠态。与以前的概率方法不同，我们的实验利用了里德堡原子实现的强烈且可控的光子-光子相互作用，因此在每一次实验中都成功地过滤了不想要的状态。近单位保真度的光子纠缠可以从初始保真度任意低的输入态中提取。该协议本质上是健壮的，在里德堡封锁制度和相互作用诱导的耗散制度下都是成功的。这种纠缠滤光器为利用多个里德堡原子系综实现可扩展的光子量子信息处理开辟了新的途径。
Devices capable of deterministically manipulating photonic entanglement are of paramount importance, because photons are ideal messengers for quantum information. However, due to the non-interacting nature of photons, many photonic quantum operations have only been demonstrated using probabilistic linear-optical approaches, leading to an overwhelming resource overhead and poor scalability. Here we report a novel entanglement filter that transmits the desired photonic entangled state and blocks unwanted ones. In contrast to previous probabilistic approaches, our experiment exploits the strong and controllable photon–photon interaction enabled by Rydberg atoms, so the filtering of undesired states succeeds in every experimental trial. Photonic entanglement with near-unity fidelity can be extracted from an input state with an arbitrarily low initial fidelity. The protocol is inherently robust, and succeeds both in the Rydberg blockade regime and in the interaction-induced dissipation regime. Such an entanglement filter opens new routes towards achieving scalable photonic quantum information processing with multiple ensembles of Rydberg atoms.