Compact non-degenerate entangled-photon source and near-infrared-to-telecom quantum teleportation
- URL: http://arxiv.org/abs/2510.03620v1
- Date: Sat, 04 Oct 2025 02:06:11 GMT
- Title: Compact non-degenerate entangled-photon source and near-infrared-to-telecom quantum teleportation
- Authors: Xu-Jie Peng, Ling-Xuan Kong, He Lu,
- Abstract summary: polarization-entangled photon source (PEPS) at non-degenerated wavelengths is pivotal to connect quantum systems working at different wavelengths.<n>Two photons with wavelengths at 810 and 1550nm are highly entangled in polarization degree of freedom.
- Score: 0.764671395172401
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The polarization-entangled photon source (PEPS) at non-degenerated wavelengths is pivotal to connect quantum systems working at different wavelengths, with the assistance of quantum teleportation. Here, a compact Sagnac-type photon source is designed and demonstrated, in which two photons with wavelengths at 810 and 1550~nm are highly entangled in polarization degree of freedom. The two photons are generated from a periodically poled lithium niobate crystal pumped with a 532~nm continuous-wave laser, via type-0 nondegenerate spontaneous parametric down-conversion. The polarization of three lights is rotated by a single periscope, which makes the Sagnac interferometer compact and stable. The generated two photons are with high brightness of $3\times10^4$ pairs/s/mW, which are highly entangled with fidelity of $0.985\pm0.002$. The entanglement is verified by violating the Clauser-Horne-Shimony-Holt inequality with $\mathcal S =2.756\pm0.007$. Finally, teleportation is demonstrated with this nondegenerate source, in which photonic states at 810~nm is teleported to 1550~nm with fidelity of $0.955\pm0.003$.
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