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Interference of spontaneous emission of light from two solid-state atomic ensembles

Staudt, M.U.
Hastings-Simon, S. R.
Ricken, R.
Suche, H.
Sohler, Ww
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Published in New Journal of Physics. 2007, vol. 9, no. 11, p. 9 p.
Abstract We report an interference experiment of spontaneous emission of light from two distant solid-state ensembles of atoms that are coherently excited by a short laser pulse. The ensembles are erbium ions doped into two LiNbO3 crystals with channel waveguides, which are placed in the two arms of a Mach–Zehnder interferometer. The light that is spontaneously emitted after the excitation pulse shows first-order interference. By a strong collective enhancement of the emission, the atoms behave as ideal two-level quantum systems and no which-path information is left in the atomic ensembles after emission of a photon. This results in a high fringe visibility of 95%, which implies that the observed spontaneous emission is highly coherent.
Stable URL https://archive-ouverte.unige.ch/unige:12879
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Deposited on : 2010-12-13

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