Side note, one of my favorite uses of LLMs is to unpack papers like these that are filled with turbo encabluator speak. Yes yes yes caveat emptor about all the possible risks associated with this practice, particularly if you have any actual responsibilities associated with that understanding.

I don't. It just for fun.

Do I have this roughly correct?

They can use light to set and unset quantum qbits? This being both efficient and providing very high data density?