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Photonic quantum technology provides a viable route to quantum communication 1,2 , quantum simulation 3 and quantum information processing 4 . Recent progress has seen the realization of boson sampling using 20 single photons 3 and quantum key distribution over hundreds of kilometres 2 . 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 5-9 . For applications, a roadblock is the poor quantum coherence on interfering single photons created by independent quantum dots 10,11 . Here we demonstrate two-photon interference with near-unity visibility (93.0 ± 0.8)% 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; temporal post-selection is not employed. By exploiting quantum interference, we demonstrate a photonic controlled-not circuit and an entanglement with fidelity of (85.0 ± 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, diode structure and relatively large quantum dot size. Our results establish a platform-GaAs quantum dots-for creating coherent single photons in a scalable way.

Titel:	Quantum interference of identical photons from remote GaAs quantum dots.
Autor/in / Beteiligte Person:	Zhai, L ; Nguyen, GN ; Spinnler, C ; Ritzmann, J ; Löbl, MC ; Wieck, AD ; Ludwig, A ; Javadi, A ; Warburton, RJ
Link:	View record at Springer (Volltext)
Zeitschrift:	Nature nanotechnology, Jg. 17 (2022-08-01), Heft 8, S. 829-833
Veröffentlichung:	London : Nature Pub. Group, 2006-, 2022
Medientyp:	academicJournal
ISSN:	1748-3395 (electronic)
DOI:	10.1038/s41565-022-01131-2
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Nat Nanotechnol] 2022 Aug; Vol. 17 (8), pp. 829-833. <i>Date of Electronic Publication: </i>2022 May 19. References: Sangouard, N., Simon, C., de Riedmatten, H. & Gisin, N. Quantum repeaters based on atomic ensembles and linear optics. Rev. Mod. Phys. 83, 33–80 (2011). (PMID: 10.1103/RevModPhys.83.33) ; Yin, H.-L. et al. Measurement-device-independent quantum key distribution over a 404 km optical fiber. Phys. Rev. Lett. 117, 190501 (2016). (PMID: 10.1103/PhysRevLett.117.190501) ; Wang, H. et al. Boson sampling with 20 input photons and a 60-mode interferometer in a 10 14 -dimensional Hilbert space. Phys. Rev. Lett. 123, 250503 (2019). (PMID: 10.1103/PhysRevLett.123.250503) ; Qiang, X. et al. Large-scale silicon quantum photonics implementing arbitrary two-qubit processing. Nat. Photon. 12, 534–539 (2018). (PMID: 10.1038/s41566-018-0236-y) ; Strauf, S. et al. 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Grant Information: 721394 EC \| EU Framework Programme for Research and Innovation H2020 \| H2020 Priority Excellent Science \| H2020 Marie Skłodowska-Curie Actions (H2020 Excellent Science - Marie Skłodowska-Curie Actions); 861097 EC \| EU Framework Programme for Research and Innovation H2020 \| H2020 Priority Excellent Science \| H2020 Marie Skłodowska-Curie Actions (H2020 Excellent Science - Marie Skłodowska-Curie Actions); 840453 EC \| EU Framework Programme for Research and Innovation H2020 \| H2020 Priority Excellent Science \| H2020 Marie Skłodowska-Curie Actions (H2020 Excellent Science - Marie Skłodowska-Curie Actions); 200020_175748 Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation); 200020_204069 Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation); 383065199 Deutsche Forschungsgemeinschaft (German Research Foundation); TRR160 Deutsche Forschungsgemeinschaft (German Research Foundation); QR.X 16KISQ009 Bundesministerium für Bildung und Forschung (Federal Ministry of Education and Research); CDFA05-06 Deutsch-Französische Hochschule (Franco-German University) Entry Date(s): Date Created: 20220519 Latest Revision: 20220815 Update Code: 20231215

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Quantum interference of identical photons from remote GaAs quantum dots.