Rubidium vapour makes a good quantum memory : technology

You do not want quite a lot of it. They’re utilizing minuscule portions (milligrams) to make the vapor. There may be about $1 price of rubidium in a vapor tube.

These vapor cells have 5 to 10mg of rubidium. At present costs, that is about $1. The price of the tube and the loopy exact tools dwarfs the usage of rubidium.

Rubidium Vapor Cell, Quartz – $475