It's not nanotech, except in the sense that anything small and interesting enough counts as nanotech. But it's a significant milestone toward a game-changing technology.
An electronic quantum processor with two qubits, each made of about a billion aluminum atoms, has been created at Yale university. They can get the qubits to maintain their state for about a microsecond. And they have a "quantum bus" that can pass information between the bits.
I don't understand all the cool things you can do with a quantum computer, but apparently it can be useful for simulating quantum chemistry. I suspect we'll have covalent-solid molecular manufacturing before this quantum computer technology develops to the point where it can help, but I've been surprised before by how fast technologies can advance.