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Deterministic measurement of a Rydberg superatom qubit via cavity-enhanced single-photon emission
Optica ( IF 10.4 ) Pub Date : 2022-07-22 , DOI: 10.1364/optica.461287
Chao-Wei Yang 1 , Jun Li 1 , Ming-Ti Zhou 1 , Xiao Jiang 1 , Xiao-Hui Bao 1 , Jian-Wei Pan 1
Affiliation  

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.

中文翻译:

通过腔增强单光子发射确定性测量里德堡超原子量子比特

通过里德堡偶极子相互作用,一个介观原子集合变成一个超原子,其行为类似于单个原子,但与光子共同耦合。作为量子信息科学中的量子比特,它可能是一个强有力的候选者,特别是对于量子网络。在本文中,我们报告了用于里德堡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数。我们利用低精细度的环形腔来增强原子-光子相互作用,并获得 44% 的光纤内单光子产生效率。利用两个里德堡能级之间的偶极子相互作用,我们可以创建多个单光子序列,或者什么都不创建,以初始量子比特状态为条件。我们在 4.8 µs 内实现了 93.0% 的测量保真度。
更新日期:2022-07-22
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