It's not just quantum error correction that is required, it's also hard to make devices small enough due to cooling, to allow thousands of qubits let alone billions.

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ziofill 6 days ago | parent [-]

not all implementations of QC require cryogenic cooling

	▲	ktallett 3 days ago \| parent [-]
		That is true but all will have components that require some cooling and scaling to billions of qubits will require cooling on a larger scale for said components.