  Contemporary quantum technologies face major difficulties in fault tolerant
quantum computing with error correction, and focus instead on various shades of
quantum simulation (Noisy Intermediate Scale Quantum, NISQ) devices, analogue
and digital quantum simulators and quantum annealers. There is a clear need and
quest for such systems that, without necessarily simulating quantum dynamics of
some physical systems, can generate massive, controllable, robust, entangled,
and superposition states. This will, in particular, allow the control of
decoherence, enabling the use of these states for quantum communications (e.g.
to achieve efficient transfer of information in a safer and quicker way),
quantum metrology, sensing and diagnostics (e.g. to precisely measure phase
shifts of light fields, or to diagnose quantum materials). In this Chapter we
present a vision of the golden future of quantum simulators in the decades to
come.
