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Chen Z, Lim HM, Huang C, et al. Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor. Phys Rev Lett. 2020;124(9):093202doi: 10.1103/PhysRevLett.124.093202.
Chen, Z., Lim, H. M., Huang, C., Dumke, R., & Lan, S. Y. (2020). Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor. Physical review letters, 124(9), 093202. https://doi.org/10.1103/PhysRevLett.124.093202
Chen, Zilong, et al. "Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor." Physical review letters vol. 124,9 (2020): 093202. doi: https://doi.org/10.1103/PhysRevLett.124.093202
Chen Z, Lim HM, Huang C, Dumke R, Lan SY. Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor. Phys Rev Lett. 2020 Mar 06;124(9):093202. doi: 10.1103/PhysRevLett.124.093202. PMID: 32202858.
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Phys Rev Lett. 2020 Mar 06;124(9):093202. doi: 10.1103/PhysRevLett.124.093202.

Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor.

Physical review letters

Zilong Chen, Hong Ming Lim, Chang Huang, Rainer Dumke, Shau-Yu Lan

Affiliations

  1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
  2. Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.

PMID: 32202858 DOI: 10.1103/PhysRevLett.124.093202

Abstract

Traditionally, measuring the center-of-mass (c.m.) velocity of an atomic ensemble relies on measuring the Doppler shift of the absorption spectrum of single atoms in the ensemble. Mapping out the velocity distribution of the ensemble is indispensable when determining the c.m. velocity using this technique. As a result, highly sensitive measurements require preparation of an ensemble with a narrow Doppler width. Here, we use a dispersive measurement of light passing through a moving room temperature atomic vapor cell to determine the velocity of the cell in a single shot with a short-term sensitivity of 5.5  μm s^{-1} Hz^{-1/2}. The dispersion of the medium is enhanced by creating quantum interference through an auxiliary transition for the probe light under electromagnetically induced transparency condition. In contrast to measurement of single atoms, this method is based on the collective motion of atoms and can sense the c.m. velocity of an ensemble without knowing its velocity distribution. Our results improve the previous measurements by 3 orders of magnitude and can be used to design a compact motional sensor based on thermal atoms.

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