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This study demonstrates the successful preservation of photonic hyperentanglement across multiple degrees of freedom using free-space optical delay lines, achieving high interference visibility after a 647 ns propagation time. The findings validate that such systems can maintain complex quantum correlations necessary for synchronization and multiplexing in future quantum communication networks. This work advances practical hardware solutions for scaling quantum repeaters without sacrificing the fidelity required for secure information transfer.
High fidelity preservation of photonic hyperentanglement in a free-space optical delay line
arXiv:2605.25609v2 Announce Type: replace Abstract: Photonic hyperentanglement enables increased information capacity and enhanced functionality for quantum communication and networking. However, synchronization of hyperentangled photon pairs requires maintaining correlations simultaneously across multiple degrees of freedom (DOFs). The preservation of polarization and energy-time entanglement in hyperentangled photon pairs is demonstrated using a free-space optical delay line based on nested Herriott cells. After a delay of 647 ns, a two-photon interference visibility of 93.9(3)% is observed in the energy-time DOF, while a CHSH parameter of 2.758(5) is obtained in the polarization DOF. These results confirm that entanglement correlations in both DOFs are preserved after propagation through the delay line. They demonstrate that free-space optical delay lines are compatible with complex photonic quantum states and provide a promising route toward delay-based memories for synchronization and multiplexing in quantum networks.
Abstract:Photonic hyperentanglement enables increased information capacity and enhanced functionality for quantum communication and networking. However, synchronization of hyperentangled photon pairs requires maintaining correlations simultaneously across multiple degrees of freedom (DOFs). The preservation of polarization and energy-time entanglement in hyperentangled photon pairs is demonstrated using a free-space optical delay line based on nested Herriott cells. After a delay of 647 ns, a two-photon interference visibility of 93.9(3)% is observed in the energy-time DOF, while a CHSH parameter of 2.758(5) is obtained in the polarization DOF. These results confirm that entanglement correlations in both DOFs are preserved after propagation through the delay line. They demonstrate that free-space optical delay lines are compatible with complex photonic quantum states and provide a promising route toward delay-based memories for synchronization and multiplexing in quantum networks.
arXiv:2605.25609 [quant-ph]
(or arXiv:2605.25609v2 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2605.25609 Focus to learn more arXiv-issued DOI via DataCite
Optics Letters Vol. 51, Issue 17, pp. 4781-4784 (2026)
https://doi.org/10.1364/OL.606763 Focus to learn more DOI(s) linking to related resources
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