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We unveil the relationship existing between the temperature of an ensemble of three-level atoms in a
configuration, and the width of the emission cone of Stokes photons that are spontaneously emitted when atoms
are excited by an optical pulse. This relationship, which is based on the amount of which-way information available
about where the Stokes photon originated during the interaction, allows us to put forward a scheme to determine
the temperature of atomic clouds by measuring the width of the emission cone. Unlike the commonly used
time-of-flight measurements, with this technique, the atomic cloud is not destroyed during each measurement.
CitationLeón, R.; Pérez, J. Measurement of the temperature of atomic ensembles via which-way information. "Physical review A", 05 Març 2012, vol. 83, núm. 3, p. 1-6.
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