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Abstract
Several effects of quantum interference in spectroscopy of a system of two atoms are discussed. (i) In the system of spatially separated atoms in a one-dimensional (1D) geometry (a single-mode waveguide or photon crystal), a (meta)stable excited entangled state can be formed, its decay being very sensitive to the distance between the atoms and to perturbations which cause a difference between their resonance frequencies. (ii) In a system of closely located atoms in 3D space, the extreme sensitivity of absorption and fluorescence spectra to the direction of the applied magnetic field is demonstrated. These theoretical predictions can be useful for the quantum information processing and ultrasensitive measurements.
Highlights
Oeg was the wavelength of the used optical transition
If one of the atoms is initially excited its spontaneous decay leads to excitation of another atom, refection from it, and if the distance between the atoms is equal to a whole number of the half-wavelengths of the optical transition, to the formation of a stable entangled state [2]
In the “ideal” case, this excited state is stable, and is formed with the 1/2 probability. In reality this state is metastable since any small deviation from the ideal condition leads to its decay
Summary
Oeg was the wavelength of the used optical transition. If one of the atoms is initially excited its spontaneous decay leads to excitation of another atom, refection from it, and if the distance between the atoms is equal to a whole number of the half-wavelengths of the optical transition, to the formation of a stable entangled state [2]. In the “ideal” case, this excited state is stable, and is formed with the 1/2 probability. In reality this state is metastable since any small deviation from the ideal condition leads to its decay.
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