The characteristics of single photons emitted by columnar microstructures based on epitaxial microcavity heterostructures with distributed Bragg reflectors, which include self-organized InAs/GaAs quantum dots and have a comparatively low Q factor in the range of 2000–3000, have been studied. It has been shown that a state with a given spin configuration—exciton with a certain polarization or trion—can be initialized in a single quantum dot under the coherent resonant linearly polarized optical pumping by a π pulse. The measurement of two-photon interference by the Hong–Ou–Mandel scheme has demonstrated that the degree of indistinguishability of successively emitted single photons is 97 and 93% at a time delay of 2 and 250 ns, respectively. Prospects of application of such sources in optical quantum computing schemes have been discussed.
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Funding
This work was supported by the Russian Foundation for Basic Research (project no. 18-02-01212) and by the State Atomic Energy Corporation Rosatom. M.V. Rakhlin acknowledges the support of the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools. A.I. Galimov and T.V. Shubina acknowledge the support of the Russian Science Foundation (project no. 20-42-01008) for the study of the properties of exciton and trion states in single quantum dots.
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Galimov, A.I., Rakhlin, M.V., Klimko, G.V. et al. Source of Indistinguishable Single Photons Based on Epitaxial InAs/GaAs Quantum Dots for Integration in Quantum Computing Schemes. Jetp Lett. 113, 252–258 (2021). https://doi.org/10.1134/S0021364021040093
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DOI: https://doi.org/10.1134/S0021364021040093