An implementation of quantum computers that is currently flourishing is one that is built out of superconducting circuits. This makes it easier to scale the quantum computer because you can leverage existing nanoelectronic fabrication techniques [1].

[0]: https://en.wikipedia.org/wiki/Timeline_of_quantum_computing

[1]: https://en.wikipedia.org/wiki/Superconducting_quantum_comput...

It wasn't until 2005 we had the first (probable) qubyte created at the University of Innsbruck in Austria.

We may actually need a new word for 2 qubits (dual-qubits? dubits?) because it seems 2 qubits are enough to break 1-bit of encryption, and I think I've read it's enough to simulate 1 atom, too.

Edit: if you read the whole link, the key description is:

"IBM’s quantum processor is made up of superconducting transmon qubits, located in a dilution refrigerator at the IBM Research headquarters at the Thomas J. Watson Research Center.

Users interact with the quantum processor through the quantum circuit model of computation, applying quantum gates on the qubits using a GUI called the quantum composer, writing quantum assembly language code[1] or through a Python API.[2]"

Which is to say you have both a quantum computer and a simulator in IBM schema (which in the cloud 'cause you can't have supercooled chips in your basement), which is as one would expect running "real" quantum computing is going to be more expensive and uncertain now despite the hope it will give vast speed later.