Details

Autor(en) / Beteiligte

• Wang, Hui
• He, Yu-Ming
• Chung, T.-H.
• Hu, Hai
• Yu, Ying
• Chen, Si
• Ding, Xing
• Chen, M.-C.
• Qin, Jian
• Yang, Xiaoxia
• Liu, Run-Ze
• Duan, Z.-C.
• Li, J.-P.
• Gerhardt, S.
• Winkler, K.
• Jurkat, J.
• Wang, Lin-Jun
• Gregersen, Niels
• Huo, Yong-Heng
• Dai, Qing
• Yu, Siyuan
• Höfling, Sven
• Lu, Chao-Yang
• Pan, Jian-Wei

Titel

Towards optimal single-photon sources from polarized microcavities

Ist Teil von

• Nature photonics, 2019-11, Vol.13 (11), p.770-775

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Nature Journals

Beschreibungen/Notizen

• An optimal single-photon source should deterministically deliver one, and only one, photon at a time, with no trade-off between the source’s efficiency and the photon indistinguishability. However, all reported solid-state sources of indistinguishable single photons had to rely on polarization filtering, which reduced the efficiency by 50%, fundamentally limiting the scaling of photonic quantum technologies. Here, we overcome this long-standing challenge by coherently driving quantum dots deterministically coupled to polarization-selective Purcell microcavities. We present two examples: narrowband, elliptical micropillars and broadband, elliptical Bragg gratings. A polarization-orthogonal excitation–collection scheme is designed to minimize the polarization filtering loss under resonant excitation. We demonstrate a polarized single-photon efficiency of 0.60 ± 0.02 (0.56 ± 0.02), a single-photon purity of 0.975 ± 0.005 (0.991 ± 0.003) and an indistinguishability of 0.975 ± 0.006 (0.951 ± 0.005) for the micropillar (Bragg grating) device. Our work provides promising solutions for truly optimal single-photon sources combining near-unity indistinguishability and near-unity system efficiency simultaneously.