Abstract
Squeezed vacuum, as a nonclassical field, has many interesting
properties and results in many potential applications for quantum
measurement and information processing. Here, we investigate a single
atom–cavity quantum electrodynamics (QED) system driven by a broadband
squeezed vacuum. In the presence of the atom, we show that both the mean
photon number and the quantum fluctuations of photons in the cavity
undergo a significant depletion due to the additional transition pathways
generated by the atom–cavity interaction. By measuring these features, one
can detect the existence of atoms in the cavity. We also show that
two-photon excitation can be significantly suppressed by the quantum
destructive interference when the squeezing parameter is very small. These
results presented here are helpful in understanding the quantum nature of
the broadband squeezed vacuum.
© 2020 Chinese Laser Press
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