Towards optimal single-photon sources from polarized microcavities
By Hui Wang, Yu-Ming He, T. Chung, Hai Hu, Ying Yu, Si Chen, X. Ding, Ming-Cheng Chen, J. Qin, Xiaoxia Yang and 14 more. Nature Photonics, 2019
442 citations recorded by the source corpus.
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.Single-photon sources with a single-photon efficiency of 0.60, a single-photon purity of 0.975 and an indistinguishability of 0.975 are demonstrated. This is achieved by fabricating elliptical resonators around site-registered quantum dots.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/300b07b087af9297a6abb45b40a1a958dcc7eefc
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Photonic quantum information processing: A concise review (2019, background): “158 ) Although quantum dots 159 can couple to optical cavities with very high efficiency, 148,160,161 a currently outstanding problem is coupling light efficiently into single mode optical fibers, with present coupling efficiencies 162 (cid:2) 33% (Ref.”
- Advances in high-dimensional quantum entanglement (2019, background): “On the technological side, highly-efficient or deterministic single-photon or photon-pair sources are necessary to increase count rates of multi-photon experiments [211].”
- High-efficiency single-photon source above the loss-tolerant threshold for efficient linear optical quantum computing (2023, unknown): “In this letter, we report a single-photon source, for the first time, reaches the loss tolerant efficiency threshold for scalable photonic quantum computing, with a system efficiency of 0.717(20), while maintaining a single-photon purity of 0.9795(6) and indistinguishability of 0.986(16).”