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arXiv · 1809.10992

Polarized indistinguishable single photons from a quantum dot in an elliptical micropillar

Yu-Ming He·Hui Wang·Stefan Gerhardt·Karol Winkler·Jonathan Jurkat·Ying Yu·Ming-Cheng Chen·Xing Ding·Si Chen·Jin Qian·Zhao-Chen Duan·Jin-Peng Li·Lin-Jun Wang·Yong-Heng Huo·Siyuan Yu·Sven Höfling·Chao-Yang Lu·Jian-Wei Pan
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Abstract

The key challenge to scalable optical quantum computing, boson sampling, and quantum metrology is sources of single photons with near-unity system efficiency and simultaneously near-perfect indistinguishability in all degrees of freedom (including spectral, temporal, spatial, and polarization). However, previous high-indistinguishability solid-state single-photon sources had to rely on polarization filtering that reduced the system efficiency by at least 50%. Here, we overcome this challenge by developing a new single-photon source based on a coherently driven quantum dot embedded in an elliptical micropillar. The asymmetric cavity lifts the polarization degeneracy into two orthogonal linearly polarized modes with a suitable energy separation. We design an excitation-collection scheme that allows the creation and collection of single photons with an indistinguishability of 0.976(1) and a degree of polarization of 91%. Our method provides a solution of combining near-unity system efficiency and indistinguishability compatible with background-free resonant excitation, and opens the way to truly optimal single-photon sources for scalable photonic quantum technologies.

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Yu-Ming He, Hui Wang, Stefan Gerhardt, Karol Winkler, Jonathan Jurkat, Ying Yu, Ming-Cheng Chen, Xing Ding, Si Chen, Jin Qian, Zhao-Chen Duan, Jin-Peng Li, Lin-Jun Wang, Yong-Heng Huo, Siyuan Yu, Sven Höfling, Chao-Yang Lu, Jian-Wei Pan. 2018-09-28. Polarized indistinguishable single photons from a quantum dot in an elliptical micropillar. https://arxiv.org/abs/1809.10992

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