Towards optimal single-photon sources from polarized microcavities

被引：383

作者：

Wang, Hui ^{[1
,2
,3
]}

He, Yu-Ming ^{[1
,2
,3
]}

Chung, T. -H. ^{[1
,2
,3
]}

Hu, Hai ^{[4
]}

Yu, Ying ^{[5
]}

Chen, Si ^{[1
,2
,3
]}

Ding, Xing ^{[1
,2
,3
]}

Chen, M. -C. ^{[1
,2
,3
]}

Qin, Jian ^{[1
,2
,3
]}

Yang, Xiaoxia ^{[4
]}

Liu, Run-Ze ^{[1
,2
,3
]}

Duan, Z. -C. ^{[1
,2
,3
]}

Li, J. -P. ^{[1
,2
,3
]}

Gerhardt, S. ^{[6
,7
]}

Winkler, K. ^{[6
,7
]}

Jurkat, J. ^{[6
,7
]}

Wang, Lin-Jun ^{[1
,2
]}

Gregersen, Niels ^{[8
]}

Huo, Yong-Heng ^{[1
,2
,3
]}

Dai, Qing ^{[4
]}

Yu, Siyuan ^{[5
]}

Hofling, Sven ^{[6
,7
,9
]}

Lu, Chao-Yang ^{[1
,2
,3
]}

Pan, Jian-Wei ^{[1
,2
,3
]}

机构：

[1] Univ Sci & Technol China, Shanghai Branch, Natl Lab Phys Sci Microscale, Shanghai, Peoples R China

[2] Univ Sci & Technol China, Shanghai Branch, Dept Modern Phys, Shanghai, Peoples R China

[3] Univ Sci & Technol China, CAS Ctr Excellence Quantum Informat & Quantum Phy, Hefei, Anhui, Peoples R China

[4] Natl Ctr Nanosci & Technol, Nanophoton Res Div, CAS Ctr Excellence Nanosci, Beijing, Peoples R China

[5] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangzhou, Guangdong, Peoples R China

[6] Univ Wurzburg, Tech Phys, Inst Phys, Wurzburg, Germany

[7] Univ Wurzburg, Wilhelm Conrad Rontgen Ctr Complex Mat Syst, Wurzburg, Germany

[8] Tech Univ Denmark, DTU Foton, Dept Photon Engn, Lyngby, Denmark

[9] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews, Fife, Scotland

来源：

NATURE PHOTONICS | 2019年 / 13卷 / 11期

基金：

中国国家自然科学基金;

关键词：

ISOLATED QUANTUM DOTS; SOLID-STATE SOURCE; EFFICIENCY; EMISSION; PERFORMANCE;

D O I：

10.1038/s41566-019-0494-3

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页码：770 / 775

页数：6

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