Researchers have shown that entangled photons can be used to improve the penetration depth of optical coherence tomography (OCT) in highly scattering materials. The method represents a way to perform OCT with mid-infrared wavelengths and could be useful for non-destructive testing and analysis of materials such as ceramics and paint samples.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/284-researchersd.jpg)
Source:
https://phys.org/news/2020-12-nondestructive-mid-infrared-imaging-entangled-photons.html