The gate logic is trivial enough, and I understand the advantages of taking a fuzzier, probabilistic (ok, yes, "precisely probabilistic", and yes, the interference effects are very neat) view towards the result of a computation. The obvious question once one realizes the feasibility of developing a Turing-complete computer using quantum gates is: what does it take to build physical qubits?

engineering.princeton.edu

Princeton Engineering - Princeton's new quantum chip built for scale

In a Nov. 5 article in the journal Nature, a Princeton team reported their new qubit lasts for over 1 millisecond — three times longer than the best ever reported in a lab setting and nearly fifteen times longer than industry standard processors. The team…