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Conference on Lasers and Electro-Optics

Single photon generation "on demand" from a single trapped atom strongly coupled to an optical cavity

Jason McKeever, Andreea Boca, A. David. Boozer, Russell Miller, H. Jeff. Kimble

Published Jan 1, 2004• 0 citations
Publisher

Abstract

Optically trapped atoms in the strong coupling regime of cavity QED have been used to generate single photons deterministically. Referenced to the total cavity output, the generation efficiency for polarized photons is 16%.
DOI
10.1364/iqec.2004.iwb3

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A single cesium atom trapped within the mode of an optical cavity is used to generate single photons on demand. The photon wave packets are emitted as a Gaussian beam with temporal profile and repetition rate controlled by external driving fields. Each generation attempt is inferred to succeed with a probability near unity, whereas the efficiency for creating an unpolarized photon in the total cavity output is 0.69 +/- 0.10, as limited by passive cavity losses. An average of 1.4 x 10(4) photons are produced by each trapped atom. These results constitute an important step in quantum information science, for example, toward the realization of distributed quantum networking.
Recent experimental advances in the field of cavity quantum electrodynamics (QED) have opened new possibilities for control of atom‐photon interactions. A laser with “one and the same atom” demonstrates the theory of laser operation pressed to its conceptual limit. The generation of single photons on demand and the realization of cavity QED with well defined atomic numbers N = 0, 1, 2,… both represent important steps toward realizing diverse protocols in quantum information science. Coherent manipulation of the atomic state via Raman transitions provides a new tool in cavity QED for in situ monitoring and control of the atom‐cavity system. All of these achievements share a common point of departure: the regime of strong coupling. It is thus interesting to consider briefly the history of the strong coupling criterion in cavity QED and to trace out the path that research has taken in the pursuit of this goal.