High-fidelity four-photon GHZ states on chip

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Pont, Mathias ; Corrielli, Giacomo ; Fyrillas, Andreas ; Agresti, Iris ; Carvacho, Gonzalo ; Maring, Nicolas ; Emeriau, Pierre-Emmanuel ; Ceccarelli, Francesco ; Albiero, Ricardo ; Ferreira, Paulo Henrique Dias ; Somaschi, Niccolo ; Senellart, Jean ; Sagnes, Isabelle ; Morassi, Martina ; Lemaitre, Aristide ; Senellart, Pascale ; Sciarrino, Fabio ; Liscidini, Marco ; Belabas, Nadia ; Osellame, Roberto

• Tipo de documento: Artigo Científico
• Fonte: NPJ QUANTUM INFORMATION; v. 10, n. 1, p. 7-pg., 2024-05-15.

Resumo

Mutually entangled multi-photon states are at the heart of all-optical quantum technologies. While impressive progresses have been reported in the generation of such quantum light states using free space apparatus, high-fidelity high-rate on-chip entanglement generation is crucial for future scalability. In this work, we use a bright quantum-dot based single-photon source to demonstrate the high fidelity generation of 4-photon Greenberg-Horne-Zeilinger (GHZ) states with a low-loss reconfigurable glass photonic circuit. We reconstruct the density matrix of the generated states using full quantum-state tomography reaching an experimental fidelity to the target state of F GHZ 4 = ( 86.0 +/- 0.4 ) % \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{{{\mathcal{F}}}}}_{{{{{\rm{GHZ}}}}}_{4}}=(86.0\pm 0.4)\, \%$$\end{document} , and a purity of P GHZ 4 = ( 76.3 +/- 0.6 ) % \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{{{\mathcal{P}}}}}_{{{{{\rm{GHZ}}}}}_{4}}=(76.3\pm 0.6)\, \%$$\end{document} . The entanglement of the generated states is certified with a semi device-independent approach through the violation of a Bell-like inequality by more than 39 standard deviations. Finally, we carry out a four-partite quantum secret sharing protocol on-chip where a regulator shares with three interlocutors a sifted key with up to 1978 bits, achieving a qubit-error rate of 10.87%. These results establish that the quantum-dot technology combined with glass photonic circuitry offers a viable path for entanglement generation and distribution. (AU)

• Processo FAPESP: 16/21322-4 - Produção de dispositivos para fotônica quântica integrada e sensores através de microfabricação com laser de femtossegundos
• Beneficiário: Paulo Henrique Dias Ferreira
• Modalidade de apoio: Bolsas no Exterior - Pesquisa