W. J. ZENG - F.A.Q.
Replies to some questions that I am frequently asked.
Q: Quantum computing is getting a lot of buzz and money. Has any quantum computer
so far performed a computation? That is, taken some inputs and given a meaningful (and useful)
output or response?
The short answer is yes. Quantum computers have performed meaningful computations, but not
yet ones that give useful advantage, i.e. ones where using classical computation is outperformed.
Some examples are
calculating the ground state energy of molecules
While these do give accurate answers for non-trival problems by running on real quantum hardware,
the instances sizes are still very small.
When asking about milestones for quantum computer performance, clear terminology is important.
a short, useful taxonomy in this post.
example of quantum supremacy was demonstrated,
which means that some computation was performed
that would be intractable to perform classically and that - in the computational complexity sense -
we believe it to be hard for a classical computer and easy for a quantum one. I'd hesitate to say that this was a useful calcuation,
though it may have application to
generating certifiable random numbers. I co-wrote a
short blog post
about what the supremacy calculation does that covers the main idea using some short Python snippets.
When it comes to performing a valuable computation, we recently released some work on the required
resources for derivative pricing
and there are there are other examples in chemistry
and prime factorization
Note that there is much left to discover in applying quantum computers.
I am optimistic that these resource requirements will continue to decrease.
Q: Does anyone make art with quantum computers / quantum tech?
There's been more then a few surprising creative uses already. There are folks looking at generating music
There is also a growing field of quantum gaming. James Wooten has an excellent
summary history of quantum computer games
(with mention of a mobile game that Jo and I made at the one of the worlds first quantum computer hackathons).
There's also a