There's an old adage among tech journalists like me - you can either explain quantum accurately, or in a way that people understand, but you can't do both.
That's because quantum mechanics - a strange and partly theoretical branch of physics - is a fiendishly difficult concept to get your head around.
It involves tiny particles behaving in weird ways. And this odd activity has opened up the potential of a whole new world of scientific super power.
Its mind-boggling complexity is probably a factor in why quantum has ended up with a lower profile than tech's current rockstar - artificial intelligence (AI).
This is despite a steady stream of recent big quantum announcements from tech giants like Microsoft and Google among others.
