Quantum Interference of Identical Photons from Remote GaAs Quantum Dots
| Title: | Quantum Interference of Identical Photons from Remote GaAs Quantum Dots |
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| Authors: | Zhai, Liang, Nguyen, Giang N., Spinnler, Clemens, Ritzmann, Julian, Löbl, Matthias C., Wieck, Andreas D., Ludwig, Arne, Javadi, Alisa, Warburton, Richard J. |
| Publication Year: | 2021 |
| Collection: | Condensed Matter Quantum Physics |
| Subject Terms: | Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: | Photonic quantum technology provides a viable route to quantum communication, quantum simulation, and quantum information processing. Recent progress has seen the realisation of boson sampling using 20 single-photons and quantum key distribution over hundreds of kilometres. Scaling the complexity requires architectures containing multiple photon-sources, photon-counters, and a large number of indistinguishable single photons. Semiconductor quantum dots are bright and fast sources of coherent single-photons. For applications, a significant roadblock is the poor quantum coherence upon interfering single photons created by independent quantum dots. Here, we demonstrate two-photon interference with near-unity visibility ($93.0\pm0.8$)\% using photons from two completely separate GaAs quantum dots. The experiment retains all the emission into the zero-phonon-line -- only the weak phonon-sideband is rejected -- and temporal post-selection is not employed. Exploiting the quantum interference, we demonstrate a photonic controlled-not circuit and an entanglement with fidelity ($85.0\pm 1.0$)\% between photons of different origins. The two-photon interference visibility is high enough that the entanglement fidelity is well above the classical threshold. The high mutual-coherence of the photons stems from high-quality materials, a diode-structure, and the relatively large quantum dot size. Our results establish a platform, GaAs QDs, for creating coherent single photons in a scalable way. Comment: 20 pages, 9 figures, supplementary information included in a separate PDF |
| Document Type: | Working Paper |
| DOI: | 10.1038/s41565-022-01131-2 |
| Access URL: | http://arxiv.org/abs/2106.03871 |
| Accession Number: | edsarx.2106.03871 |
| Database: | arXiv |
| DOI: | 10.1038/s41565-022-01131-2 |
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