Entanglement swapping systems toward a quantum internet

Journal Article · Mon Mar 24 04:00:00 EDT 2025 · No journal information

DOI:https://doi.org/10.48550/arXiv.2503.18906· OSTI ID:2563134

Davis, Samantha I. ^[1]; Valivarthi, Raju ^[1]; Cameron, Andrew ^[2]; Pena, Cristian ^[2]; Xie, Si ^[3]; Narvaez, Lautaro ^[1]; Lauk, Nikolai ^[4]; Li, Chang ^[4]; Taylor, Kelsie ^[4]; Youssef, Rahaf ^[1]; Wang, Christina ^[3]; Kapoor, Keshav ^[2]; Korzh, Boris ^[5]; Sinclair, Neil ^[6]; Shaw, Matthew ^[5]; Spentzouris, Panagiotis ^[2]; Spiropulu, Maria ^[1]

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1. Caltech
2. Fermilab
3. Caltech; Fermilab
4. Caltech, Pasadena (main)
5. Caltech, JPL
6. Caltech; Harvard U.

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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Caltech, Pasadena (main); Caltech, JPL; Harvard U.; Caltech
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: 89243024CSC000002
• OSTI ID: 2563134
• Report Number(s): FERMILAB-PUB-25-0184-ETD; arXiv:2503.18906; oai:inspirehep.net:2903867
• Journal Information: No journal information, Journal Name: No journal information
• Country of Publication: United States
• Language: English