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Quantum breaking BTC!

No.

It would required 2400 Shor compliant Logical Qubits with error correction of 10^-12, with all qubits working in perfectly symphony with no decoherence. Also each shor logical qubit should use around 8000 physical qubits for a grand total of 18 million physical qubits.

So far we haven't even created 1 such Shor compliant logical Qubit.

The best we've done so far is 2 logical qubits using 50-100 physical qubits with an error correction of only 10^-3.

Which means we are at least 10 years away from creating a single Shor compliant logical qubit required to break ECDSA. Let alone 2400 working in perfectly symphony.

And even if we do, there are many ways to upgrade to quantum resistant addresses.

#bitcoin #freedom #nostr #hardmoney #asknostr

anonymous 8mo ago

Do you have sources for those numbers?

I know nr of physical qubits may also vary per methods, and there are 6+ methods out there. From my understanding, in the end it's about reliable logical qubits with sufficient retention.

Are the logical qubits all there is? Are the toffoli gates strictly an extra number or can you trade off one for the other to some extent? (Just wondering.)

I'm curious what method, configuration and such will prove most reliable.

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Discussion

anonymous 8mo ago

Also, P2PKH already prevents early exposure. Right? So as long as an address is used only once, it is safe until the bitcoin transaction is created to spend the utxo. (So short window before confirmation that it's vulnerable. So essentially only a window for (near-)real-time attacks.

That's my understanding of the situation, at least.