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Paper 1

Security of two-state and four-state practical quantum bit-commitment protocols

Ricardo Loura, Dušan Arsenović, Nikola Paunković, Duška B. Popović, Slobodan Prvanović

Year

2016

Journal

Physical Review A

DOI

10.1103/physreva.94.062335

arXiv

-

No abstract.

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Paper 2

Compact non-degenerate entangled-photon source and near-infrared-to-telecom quantum teleportation

Xu-Jie Peng, Ling-Xuan Kong, He Lu

Year

2025

Journal

arXiv preprint

DOI

arXiv:2510.03620

arXiv

2510.03620

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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