DOE OSTI · 2563134
Entanglement swapping systems toward a quantum internet
Abstract
We demonstrate conditional entanglement swapping, i.e. teleportation of entanglement, between time-bin qubits at the telecommunication wavelength of 1536.4 nm with high fidelity of 87%. Our system is deployable, utilizing modular, off-the-shelf, fiber-coupled, and electrically controlled components such as electro-optic modulators. It leverages the precise timing resolution of superconducting nanowire detectors, which are controlled and read out via a custom developed graphical user interface. The swapping process is described, interpreted, and guided using characteristic function-based analytical modeling that accounts for realistic imperfections. Our system supports quantum networking protocols, including source-independent quantum key distribution, with an estimated secret key rate of approximately 0.5 bits per sifted bit.
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Davis, Samantha I. [Caltech] (ORCID:0000000199948165), Valivarthi, Raju [Caltech], Cameron, Andrew [Fermilab], Pena, Cristian [Fermilab] (ORCID:0000000245007930), Xie, Si [Caltech; Fermilab] (ORCID:0000000325095731), Narvaez, Lautaro [Caltech], Lauk, Nikolai [Caltech, Pasadena (main)], Li, Chang [Caltech, Pasadena (main)], Taylor, Kelsie [Caltech, Pasadena (main)], Youssef, Rahaf [Caltech], Wang, Christina [Caltech; Fermilab], Kapoor, Keshav [Fermilab], Korzh, Boris [Caltech, JPL], Sinclair, Neil [Caltech; Harvard U.], Shaw, Matthew [Caltech, JPL], Spentzouris, Panagiotis [Fermilab], Spiropulu, Maria [Caltech] (ORCID:0000000181727081). 2025-03-24. Entanglement swapping systems toward a quantum internet. https://doi.org/10.48550/arxiv.2503.18906
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