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> Jumping is also real, but we need not worry about people jumping out of the atmosphere.

If people are jumping twice as high this year than last, we would ;) https://www.researchgate.net/figure/A-chart-shows-the-progre...

(BTW this reply is not meant to make a point about the state of quantum -- it's complicated -- but merely as a response to the analogy)

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I'm not much of a believer. It's worth pointing out that as the number of qubits goes up, so too does the error rate.

A larger number of qubits allows us to do effective quantum error correction. The idea is to group multiple physical qubits into one logical qubit, think of it as redundancy.

So what's the number of logical qubits we have achieved working practically then? Is this scalable, or is it just going to exponentially require physical qubits for each additional logical qubit?

Genuine question. I've no idea.

Quantum error correction has been experimentally demonstrated for a single logical qubit, e.g. [0][1]. Even though there might be implementations of multiple such qubits, we're still very much in the "Noisy Intermediate-Scale Quantum" era.

Generally, the number of physical qubits scales linearly with the number of logical qubits.

[0] https://journals.aps.org/prx/abstract/10.1103/PhysRevX.11.04... [1] https://www.nature.com/articles/s41586-022-04566-8

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