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arXiv · 1303.4058

On-demand semiconductor single-photon source with near-unity indistinguishability

Yu-Ming He·Yu He·Yu-Jia Wei·Dian Wu·Mete Atatüre·Christian Schneider·Sven Höfling·Martin Kamp·Chao-Yang Lu·Jian-Wei Pan
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Abstract

Single photon sources based on semiconductor quantum dots offer distinct advantages for quantum information, including a scalable solid-state platform, ultrabrightness, and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state networks is a high level of efficiency and indistinguishability. Pulsed resonance fluorescence (RF) has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed RF single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3-ps laser pulses. The pi-pulse excited RF photons have less than 0.3% background contributions and a vanishing two-photon emission probability. Non-postselective Hong-Ou-Mandel interference between two successively emitted photons is observed with a visibility of 0.97(2), comparable to trapped atoms and ions. Two single photons are further used to implement a high-fidelity quantum controlled-NOT gate.

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Yu-Ming He, Yu He, Yu-Jia Wei, Dian Wu, Mete Atatüre, Christian Schneider, Sven Höfling, Martin Kamp, Chao-Yang Lu, Jian-Wei Pan. 2013-03-17. On-demand semiconductor single-photon source with near-unity indistinguishability. https://doi.org/10.1038/nnano.2012.262

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