Telecom-compatible polarization-to-time-bin conversion of atom-photon entanglement for heterogeneous quantum networks

• URL: http://arxiv.org/abs/2607.29609v1
• Date: Fri, 31 Jul 2026 16:45:13 GMT
• Title: Telecom-compatible polarization-to-time-bin conversion of atom-photon entanglement for heterogeneous quantum networks
• Abstract summary: We demonstrate an interface that converts atom-photon entanglement from polarization encoding at an atomic wavelength to time-bin encoding in the telecom C-band.<n>This is the first demonstration of polarization-to-time-bin conversion of photons entangled with a single atomic quantum memory.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A key enabling feature of future quantum networks is interoperability between platforms that operate at different wavelengths and with different qubit encodings. We demonstrate an interface that converts atom-photon entanglement from polarization encoding at an atomic wavelength to time-bin encoding in the telecom C-band. Atom-entangled photons at 854 nm are generated from a single $^{40}$Ca$^+$ ion. After quantum frequency conversion to 1550 nm, the photonic polarization qubit is converted into a time-bin qubit using a fiber-based Mach--Zehnder-like encoder. Full quantum tomography of the final state verifies that the process preserves entanglement with 96.3(4.2)% fidelity. Together with the independent work of Ferrari et al. [arXiv:2607.07805 (2026)], this is the first demonstration of polarization-to-time-bin conversion of photons entangled with a single atomic quantum memory. The telecom-compatible interface enables robust qubit transmission over optical fibers and provides a key building block for heterogeneous quantum networking architectures.

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