  Nowadays, quantum computing has reached the engineering phase, with
fully-functional quantum processors integrating hundred of noisy qubits
available. Yet -- to fully unveil the potential of quantum computing out of the
labs and into business reality -- the challenge ahead is to substantially scale
the qubit number, reaching orders of magnitude exceeding the thousands (if not
millions) of noise-free qubits. To this aim, there exists a broad consensus
among both academic and industry communities about considering the distributed
computing paradigm as the key solution for achieving such a scaling, by
envision multiple moderate-to-small-scale quantum processors communicating and
cooperating to execute computational tasks exceeding the computational
resources available within a single processing device. The aim of this survey
is to provide the reader with an overview about the main challenges and open
problems arising with distributed quantum computing, and with an easy access
and guide towards the relevant literature and the prominent results from a
computer/communications engineering perspective.
