Abstract
A current challenge within the emerging field of optical quantum information processing is to construct an efficient single-photon source (SPS) capable of emitting single indistinguishable photons on demand. An attractive platform for such a source is a quantum light emitter, e.g. a nitrogen-vacancy center or a semiconductor quantum dot (QD), embedded in a solid-state semiconductor host material [1]. For a QD in bulk material, the large index contrast at the semiconductor-air interface leads to a collection efficiency of only 1-2 %, and efficient light extraction thus poses a major challenge in SPS engineering. An approach based on a InAs QD in a photonic nanowire [2] to control the light emission was recently proposed. A second generation device based on the “trumpet” design [3] featuring an inverted taper recently resulted in a measured efficiency of 0.75 under optical excitation. These SPS designs do not employ a cavity meaning that efficient coupling from the QD to the guided mode is obtained over a broad spectral range above 100 nm.
© 2015 IEEE
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