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  • Open Access

Enhancing fiber atom interferometer by in-fiber laser cooling

Yu Wang1, Shijie Chai1, Thomas Billotte2, Zilong Chen1, Mingjie Xin1, Wui Seng Leong1, Foued Amrani2, Benoit Debord2, Fetah Benabid2 et al.

Shau-Yu Lan1,*

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
  • 2GPPMM Group, XLIM Institute, CNRS UMR 7252, University of Limoges, Limoges 87060, France

  • *sylan@ntu.edu.sg
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Phys. Rev. Research 4, L022058 – Published 13 June, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L022058

Abstract

We demonstrate an inertia sensitive atom interferometer optically guided inside a 22-cm-long negative curvature hollow-core photonic crystal fiber with an interferometer time of 20 ms. The result improves the previous fiber guided atom interferometer sensitivity by three orders of magnitude. The improvement arises from the realization of in-fiber Λ-enhanced gray molasses and delta-kick cooling to cool atoms from 32μK to below 1μK in 4 ms. The in-fiber cooling overcomes the inevitable heating during the atom loading process and allows a shallow guiding optical potential to minimize decoherence. Our results permit bringing atoms close to source fields for sensing and could lead to compact inertial quantum sensors with a submillimeter resolution.

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Phys. Rev. Research 4, L022058– Published 13 June, 2022
  • Received 20 December 2021
  • Revised 7 February 2022
  • Accepted 16 May 2022
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