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Sunlight-Powered Passive Quantum Ghost Imaging Achieves 90% Visibility

5/26/2026

Summary

Story summary

Researchers Wuhong Zhang and Lixiang Chen of Xiamen University built a fully passive quantum imaging system using sunlight.
A sun-tracking mount sent sunlight through a 20 m plastic multimode fiber into a PPKTP crystal, generating photon pairs that yielded ghost images with 90.7 % visibility, near the 95.5 % from a laser.
They also created a two-dimensional ghost face image, the first sunlight-pumped SPDC with ghost imaging, suggesting remote or space-based quantum imaging.

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Story summary

Researchers Wuhong Zhang and Lixiang Chen of Xiamen University built a fully passive quantum imaging system using sunlight.
A sun-tracking mount sent sunlight through a 20 m plastic multimode fiber into a PPKTP crystal, generating photon pairs that yielded ghost images with 90.7 % visibility, near the 95.5 % from a laser.
They also created a two-dimensional ghost face image, the first sunlight-pumped SPDC with ghost imaging, suggesting remote or space-based quantum imaging.