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 has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3 ps laser pulses. The π pulse-excited resonance-fluorescence photons have less than 0.3% background contribution 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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The authors thank Y. Yu, Z. Xi, J. Bowles, K. Chen, C. Matthiesen, X-L. Wang, L-J. Wang, N. Vamivakas and Y. Zhao for helpful discussions. This work was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences (CAS) and the National Fundamental Research Program (grant nos 2011CB921300, 2013CB933300), and the State of Bavaria. M.A. acknowledges the CAS visiting professorship. C-Y.L. acknowledges the Anhui Natural Science Foundation and Youth Qianren Program.
The authors declare no competing financial interests.
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He, YM., He, Y., Wei, YJ. et al. On-demand semiconductor single-photon source with near-unity indistinguishability. Nature Nanotech 8, 213–217 (2013). https://doi.org/10.1038/nnano.2012.262
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