Thermal counting statistics in an atomic two-mode squeezed vacuum state
2019
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice.
Although the produced two-mode squeezed vacuum state is pure, each individual mode is described as a statistical mixture. We confirm the prediction that the particle number follows an exponential distribution when only one spatio-temporal mode is selected. We also show that this distribution accounts well for the contrast of an atomic Hong--Ou--Mandel experiment.
These experiments constitute an important validation of our twin beam source in view of a future test of a Bell inequality.
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