Quantum-state readout using stimulated emissions

Abstract

Quantum-state readout for an atom is performed using stimulated emission, e.g., by illuminating the atoms with electromagnetic radiation (EMR) with wavelengths selected to stimulate photon emission from the atom. Such an emission can be stimulated using four-wave mixing, in this case, three illumination wavelengths are mixed to stimulate the emissions wavelength. The illumination wavelengths are detuned from nearby resonant wavelengths to avoid capture by an atom orbital, which would lead to spontaneous rather than stimulated emission. The stimulated emissions are directional facilitating capture of a strong signal. The illumination wavelengths can be selected to be in different directions from the emissions wavelength to minimize noise in the emissions detection. The net result is a high-signal-to-noise ratio detection signal and quantum-state readout.

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