  Controlled quantum machines have matured significantly. A natural next step
is to grant them autonomy, freeing them from timed external control. For
example, autonomy could unfetter quantum computers from classical control wires
that heat and decohere them; and an autonomous quantum refrigerator recently
reset superconducting qubits to near their ground states, as is necessary
before a computation. What conditions are necessary for realizing useful
autonomous quantum machines? Inspired by recent quantum thermodynamics and
chemistry, we posit conditions analogous to DiVincenzo's criteria for quantum
computing. Our criteria are intended to foment and guide the development of
useful autonomous quantum machines.
