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“We’re going to have quantum money. You’re going to see some successor to Bitcoin that’s quantum encryption resistant. That’ll be the next move. It won’t be in the next few years, but that’s what you want to keep an eye on. There’s going to be some flurry of quantum money coins that are created in a few years’ time.”
From: Bits + Bips Podcast, 7th May 2026..
This sound a little fantastic, but it really isn’t. That mention of “quantum money coins” caught my attention because it is entirely possible to use quantum mechanics to create electronic cash using the physical properties of nature. The Swedish central bank published an interesting paper about this a few years ago which, while noting that any such implementation might be far in the future, also suggested that this could be a very good way to transmit electronic cash instantaneously across the universe.
From: (13) Sending Money is harder than Sending Pictures of Cats.
Quantum money exploits the fact that it is not possible to clone an unknown quantum state. This means that a counterfeiter, even with access to unlimited resources, will still not be able to copy a quantum coin. Why the Swedish central bank research paper wasn’t called “Schrödinger’s Cash” I’ll never know, but I guess they’re not marketing people.
In the podcast Austin Campbell, Ram Ahluwalia and Chris Perkins go on to talk about what might come after Bitcoin. This is a subject that fascinates me, and not only because I wrote a book about (it’s called “Before Babylon, Beyond Bitcoin”, by the way) and have taken part in numerous discussions, panels and workshops on the topic. Ram says “It’s going to be wrapped energy, wrapped compute”. Again, something that sounds radical on first hearing but actually the idea that energy might be a future currency has a long heritage. So when they go on to observe that “the best digital asset might not yet exist” I have to say that I fundamentally agree with this (to me at least) obvious point. Bitcoin may well turn out to be the Compuserve of currency.