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Science

Resonance Between Atoms

Published Jul 31, 1998• 0 citations
Publisher
DOI
10.1126/science.281.5377.617m

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The dynamics of a resonant atom interacting with a quantum cavity field in the presence of many off-resonant atoms is studied. In the framework of the effective Hamiltonian approach we show that the results of elimination of non-resonant transitions are (a) a dynamical Stark shift of the field frequency, dependent on the populations of non-resonant atoms, (b) dependence of the coupling constant between the resonant atom and the field on the populations of non-resonant atoms, and (c) an effective dipole–dipole interaction between non-resonant atoms. Two effects (the coherent influence and dephasing) of the off-resonant environment on the dynamics of the resonant atom are discussed.
A nanostructural object consisting of two atoms is proven to contain two or four dimensional resonances depending on whether these atoms are identical or different. Each of the atoms is characterized by linear isotropic polarizability and contains one isolated resonance. The frequency of the dimensional resonances considerably differs from the resonance frequencies of the isolated atoms, and the effective resonance polarizabilities of the atoms in the nanostructure approximately coincide with the resonance values of polarizabilities of the isolated atoms. It is shown that, in the nanostructure consisting of two different atoms, two of four resonances have a negative dispersion. It is also shown that the nanostructural object has an induced anisotropy in the case of a fixed position of the object axis relative to the direction of incidence of the external wave.
We propose a hybrid system to realize long information storage and fast quantum operation via Rydberg atoms and superconducting qubits (SCQs). The internal states of a Rydberg atom are coupled to a nanomechanical resonator. The atom-resonator coupling is achieved via an electric field generated by the quantized motions of the resonator and temporarily exciting the atom to Rydberg states. The coupling can be made large enough to allow quantum manipulation and measurement of the resonator via the atom. The resonator can also be coupled to a SCQ, and therefore the tripartite system can provide a quantum interface between the SCQ and the atom via the nanomechanical resonator.