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Chinese Optics Letters

Photon emission from a tweezer-trapped single atom in an optical microcavity

Dongyu Huang, Xiaolong Zhou, Zemin Shen, Sijian He, Qiyang Huang, Jian Wang, Chuanfeng Li, Guang-Can Guo

Published Jan 1, 2026• 0 citations
Publisher
DOI
10.3788/col202624.112702

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ABSTRACT Neutral atoms coupled to optical microcavities provide an efficient atom‐photon interface for quantum computing, quantum networking and quantum metrology. However, the finite trapping lifetime of atoms generally requires cyclic atom transfer, which interrupts the atom‐cavity interaction and limits the applications of cavity QED experiments. Here, we realize continuous coupling of rubidium atoms to an optical microcavity. Continuous transfer of atoms from a magneto‐optical trap into the optical microcavity is achieved using a near‐resonant optical dipole trap, enabling strong coupling between an atomic ensemble and the microcavity with a vacuum Rabi splitting of 395(2) MHz. To demonstrate a potential application, we further realize continuous heralded single‐photon emission and measure a minimum value of the heralded second‐order correlation function, . These results pave the way for the continuous transfer of atoms into optical microcavities and broaden the application prospects of laser‐cooled atoms coupled to optical microcavities.
We demonstrate a miniature, fiber-coupled optical tweezer to trap a single atom. The same fiber is used to trap a single atom and to read out its fluorescence. To obtain a low background level, the tweezer light is chopped, and we measure the influence of the chopping frequency on the atom's lifetime. We use the single atom as a single-photon source at 780 nm and measure the second-order correlation function of the emitted photons. Because of its miniature, robust, fiber-pigtailed design, this tweezer can be implemented in a broad range of experiments where single atoms are used as a resource.