Quantum technologies, i.e. technological devices obtained by building and manipulating quantum mechanical systems, are becoming a reality. The most prominent example is given by quantum computers, where the unit of information, the bit, is replaced by its quantum mechanical counterpart, informally called the qubit. Contrary to classical computers, quantum computers promise to use the full quantum mechanical features of qubits, in order to address and solve computational problems which would be out of reach by using classical computers. As an example, the Canadian company Xanadu recently claimed that its quantum computer has been able to solve, in just 36 microseconds, a computational task that would have required 9000 years using state-of-the-art supercomputers.
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