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Bright Polarized Single-Photon Source Based on a Linear Dipole

2021; American Physical Society; Volume: 126; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.126.233601

1092-0145

S. E. Thomas, Marie Billard, N. Coste, Stephen C. Wein, Priya Priya, H. Ollivier, O. Krebs, L. Tazaïrt, Abdelmounaïm Harouri, A. Lemaı̂tre, I. Sagnes, C. Antón, L. Lanco, N. Somaschi, J. C. Loredo, P. Senellart,

Semiconductor Lasers and Optical Devices

Semiconductor quantum dots in cavities are promising single-photon sources. Here, we present a path to deterministic operation, by harnessing the intrinsic linear dipole in a neutral quantum dot via phonon-assisted excitation. This enables emission of fully polarized single photons, with a measured degree of linear polarization up to 0.994 $\pm$ 0.007, and high population inversion -- 85\% as high as resonant excitation. We demonstrate a single-photon source with a polarized first lens brightness of 0.50 $\pm $ 0.01, a single-photon purity of 0.954 $\pm$ 0.001 and single-photon indistinguishability of 0.909 $\pm$ 0.004.