Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor
- URL: http://arxiv.org/abs/2003.03491v1
- Date: Sat, 7 Mar 2020 02:20:39 GMT
- Title: Quantum-Enhanced Velocimetry with Doppler-Broadened Atomic Vapor
- Authors: Zilong Chen, Hong Ming Lim, Chang Huang, Rainer Dumke, and Shau-Yu Lan
- Abstract summary: 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.
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.
- Score: 3.930404762282402
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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
$\mu$m 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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