16 qubits? How hard is it to simulate those 16 qubits with a regular computer? I get this is marketing but people would be better off just running a simulator at this point.
However, once you start adding more qubits the simulation part becomes hard to infeasible. I think I saw some paper which simulated around 40 qubits. Here the wavefunction already needs 16 TiB, so you need a big HPC cluster to run that.
The problems start to set in if your RAM can't hold the wavefunction in memory (so around 28 qubits, which takes 2^32 bytes = 4GB of RAM.)
With specialized code and supercomputers you can get a little farther, but you will be fighting exponential growth, so not too much. The practical limit for classical computers is in the 40-50 qubit range.
One megabyte was enough even for quantum computing! Wow. Bill Gates, what a visionary ;-)