The theoretical advantages provided by the quantum information paradigm are nowadays well established, and many diverse solid-state, optical, superconductor candidates for scalable quantum devices are being tested, as well as different approaches to the computation paradigm.
The main obstacles towards to realization of scalable quantum architectures are represented by the fast decoherence effects (that is, the loss of the state superpositions that give raise to the advantage of the quantum information) in solid state devices. Fault-tolerant, error-correcting or noiseless protocols have been proposed in order to protect the fragile quantum coherence. Control and system theories offer a framework and a number of design approaches that proved to be useful in the realization of protected quantum information, and in the design of quantum logic gates under optimality and robustness constraints. Control and filtering theories also successfully provide new tools for modeling, manipulating and measuring quantum systems in NMR application, quantum optics, quantum metrology and nano-mechanical systems.