Long-term stability of squeezed light in a fiber-based system using automated alignment.

Autor:	Nakamura T; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan., Nomura T; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan., Endo M; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan., Sakaguchi A; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan., Ruofan H; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan., Kashiwazaki T; NTT Device Technology Labs, NTT Corporation, 3-1, Morinosato Wakamiya, Atsugi 243-0198, Kanagawa, Japan., Umeki T; NTT Device Technology Labs, NTT Corporation, 3-1, Morinosato Wakamiya, Atsugi 243-0198, Kanagawa, Japan., Takase K; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan., Asavanant W; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan., Yoshikawa JI; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan., Furusawa A; Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.; Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1, Hirosawa, Wako 351-0198, Saitama, Japan.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2024 Sep 01; Vol. 95 (9).
DOI:	10.1063/5.0203988
Abstrakt:	Providing a cloud service for optical quantum computing requires stabilizing the optical system for extended periods. It is advantageous to construct a fiber-based system, which does not require spatial alignment. However, fiber-based systems are instead subject to fiber-specific instabilities. For instance, there are phase drifts due to ambient temperature changes and external disturbances and polarization fluctuations due to the finite polarization extinction ratio of fiber components. Here, we report the success of measuring squeezed light with a fiber system for 24 h. To do this, we introduce stabilization mechanics to suppress fluctuations in the fiber system and an integrated controller to automatically align the entire system. The squeezed light at a wavelength of 1545.3 nm is measured every 2 min, where automated alignments are inserted every 30 min. The squeezing levels with an average of -4.42 dB are recorded with an extremely small standard deviation of 0.08 dB over 24 h. With the technologies developed here, we can build complicated optical setups with the fiber-based system and operate them automatically for extended periods, which is promising for cloud service of quantum computation. (© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license (https://creativecommons.org/licenses/by-nc-nd/4.0/).)
Databáze:	MEDLINE
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