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Regular version of the site

Article

Decay of metastable excited states of two qubits in a waveguide

Physical Review A: Atomic, Molecular, and Optical physics. 2014. Vol. 90. P. 063829 (1)-063829 (12).
Redchenko E. S., Yudson V.I.

For a system of two spatially separated qubits (two-level atoms) coupled to a one-dimensional waveguide
we have described the time evolution of singly or doubly excited states of the atomic subsystem. When the
interatomic distance l takes special (“resonant” or “antiresonant”) values, the singly excited system of resonant
atoms can form metastable (dark) states. If l slightly deviates from one of the special values or the atomic
frequencies do not coincide, the dark states slowly decay and we have calculated the decay rate. Also, we have
found that the doubly excited state of two resonant atoms located at the special positions does not completely
decay but, with a finite probability, can evolve (with the emission of a single photon) to one of the metastable
singly excited states. Metastable states of pairs of qubits may find applications (e.g., as memory elements) in
information processing or as detectors sensitive to external perturbations.