Institut Néel Grenoble

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The realization of an e’ cient, single-photon source - that is a device that can produce photons one by one on demand - is an important goal for quantum cryptography and more generally for the future development of photonic quantum information processing. In this ontext, semiconductor quantum dots (QDs) are very attractive : at low temperature, they can offer a stable single-photon emission with a nearly perfect radiative yield. However, they are generally embedded in a high index semiconductor matrix that prevents the e’ cient collection of light in the far ! eld. We have overcome this limitation and demonstrated a very bright singlephoton source by inserting the quantum dot inside a novel, well controlled electromagnetic environment : a photonic nanowire. (Full text)

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