Deterministic measurement of a Rydberg superatom qubit via cavity-enhanced single-photon emission
Deterministic measurement of a Rydberg superatom qubit via cavity-enhanced single-photon emission
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通过腔增强单光子发射对里德堡超原子量子位进行确定性测量
DOI：
10.1364/optica.461287
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发表时间：
2022
期刊：
影响因子：
10.4
通讯作者：
Jian-Wei Pan
中科院分区：
文献类型：
--
作者：
Chao-Wei Yang;Jun Li;Ming-Ti Zhou;Xiao Jiang;Xiao-Hui Bao;Jian-Wei Pan
在里德伯偶极相互作用下，介观原子系综变成了一个行为像单个原子但与光子集体耦合的超原子。它是量子信息科学中潜在的强有力的候选量子比特，特别是在量子网络中。在本文中，我们报道了一个用于里德伯超原子的腔增强单光子接口，并通过光子爆发演示了确定性量子比特读出。我们利用低精细度环形腔增强了原子与光子的相互作用，获得了44%的光纤内单光子产生效率。利用两个里德伯能级之间的偶极相互作用，我们可以创建多个单光子序列，或者什么都没有，条件是初始量子位态。我们在4.8µs内实现了93.0%的测量保真度。我们的工作补充了利用里德伯超原子进行量子信息应用的实验工具箱。
With Rydberg dipole interactions, a mesoscopic atomic ensemble becomes a superatom that behaves like a single atom but couples collectively with photons. It is potentially a strong candidate as a qubit in quantum information science, especially for quantum networks. In this paper, we report a cavity-enhanced single-photon interface for a Rydberg superatom and demonstrate deterministic qubit readout via a photon burst. We make use of a low-finesse ring cavity to enhance the atom–photon interaction and obtain in-fiber single-photon generation efficiency of 44%. Harnessing the dipole interaction between two Rydberg levels, we may create either a sequence of multiple single photons or nothing, conditioned on an initial qubit state. We achieve a measurement fidelity of 93.0% in 4.8 µs. Our work complements the experimental toolbox of harnessing Rydberg superatoms for quantum information applications.