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Title: Quantum-enhanced velocimetry with Doppler-broadened atomic vapor
Authors: Chen, Zilong
Lim, Hong Ming
Huang, Chang
Dumke, Rainer
Lan, Shau-Yu
Keywords: Physics - Atomic Physics
Physics - Atomic Physics
Quantum Physics
Issue Date: 2020
Source: 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-. doi:10.1103/PhysRevLett.124.093202
Project: NRFF2013-12
Journal: Physical Review Letters
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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.124.093202
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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