Researchers at Purdue University have created a quantum spin wave for light. This can be a carrier of information for future nanotechnologies but with a unique twist: they only flow in one direction.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/5d5aa36ee15cc.jpg)
Source:
https://phys.org/news/2019-08-document-quantum.html