Precise and extensive characterization of an optical resonator for cavity-based quantum networks

Dowon Lee, Myunghun Kim, Jungsoo Hong, Taegyu Ha, Junwoo Kim, Sungsam Kang, Youngwoon Choi, Kyungwon An, Moonjoo Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Cavity-based quantum node is a competitive platform for distributed quantum networks. Here, we characterize a high-finesse Fabry-Pérot optical resonator for coupling single or few atomic quantum registers. Our cavity consists of two mirrors with different reflectivities: One has minimal optical loss, and the other high transmission loss where more than 90% of the intracavity photons would be emitted. Cavity finesse, birefringent effects, and mechanical resonances are measured using the lasers at 780, 782, and 795 nm. In order to obtain cavity geometric parameters, we drive the adjacent longitudinal or transverse modes with two lasers simultaneously, and measure those frequencies using a precision wavelength meter (WLM). A major novelty of this method is that the parameters’ uncertainties are solely determined by the resolution of the WLM, eliminating all of the temporal environment fluctuations. Our scheme makes it possible to quantify the atom-cavity coupling constant up to four significant figures, the most precise and accurate estimation so far, which would become a key ingredient for benchmarking a cavity-based quantum node. Furthermore, the distortion of polarized photonic qubits would be minimized owing to the small birefringent splitting, below 4.9% of the cavity linewidth. Our system should operate in the intermediate atom-cavity coupling regime that would allow us to implement various quantum network protocols.

Original languageEnglish
Pages (from-to)603-614
Number of pages12
JournalOSA Continuum
Issue number3
Publication statusPublished - 2022 Mar 15

Bibliographical note

Funding Information:
Funding. Samsung Science and Technology Foundation (SRFC-TC2103-01, SSTF-BA2101-07); Samsung Electronics Co., Ltd. (IO201211-08121-01); BK21 FOUR program; National Research Foundation of Korea (2019R1A5A102705513, 2020R1A2C3009299, 2020R1I1A2066622).

Funding Information:
Acknowledgments. We thank Jae-Yoon Sim for experimental support and Josef Schupp for helpful discussions. K. An was supported by the National Research Foundation (Grant No. 2020R1A2C3009299). This work has been supported by National Research Foundation (Grant No. 2019R1A5A102705513 and 2020R1l1A2066622), BK21 FOUR program, Samsung Science and Technology Foundation (SSTF-BA2101-07 and SRFC-TC2103-01), and Samsung Electronics Co., Ltd (IO201211-08121-01).

Publisher Copyright:
© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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