4,002 research outputs found
Quantum Coherence and Correlations of optical radiation by atomic ensembles interacting with a two-level atom in microwave cavity
We examine quantum statistics of optical photons emitted from atomic
ensembles which are classically driven and simultaneously coupled to a
two-level atom via microwave photon exchange. Quantum statistics and
correlations are analyzed by calculating second order coherence degree, von
Neumann entropy, spin squeezing for multi-particle entanglement, as well as
genuine two and three-mode entanglement parameters for steady state and
non-equilibrium situations. Coherent transfer of population between the
radiation modes and quantum state mapping between the two-level atom and the
optical modes are discussed. A potential experimental realization of the
theoretical results in a superconducting coplanar waveguide resonator
containing diamond crystals with Nitrogen-Vacancy color centers and a
superconducting artificial two-level atom is discussed.Comment: 15 pages, 17 figures, submitted to Phys. Rev.
Entanglement in atomic resonance fluorescence
The resonance fluorescence from regular atomic systems is shown to represent
a continuous source of non-Gaussian entangled radiation propagating in two
different directions. For a single atom entanglement occurs under the same
conditions as squeezing. For more atoms, the entanglement can be more robust
against dephasing than squeezing, hence providing a useful continuous source
for various applications of entangled radiation.Comment: 4 pages, 1 figur
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