[seidlitz]

A number of companies like D-Wave, Rigetti, IBM, Intel, and Google already have processors working on quantum principals (https://en.wikipedia.org/wiki/List_of_quantum_processors). There are also examples of quantum algorithms that are demonstrated to work. The main question is weather quantum computers will be able to do anything that classical computers can't do (or do it cheaper/faster). There is still a number of obstacles that need to be overcome to make quantum computing reality—a so called DiVincenzo's criteria:

- physical scalability of qubits; - qubits initialization - dealing with quaantum decoherence - universal gate set; - reliable reading of qubit states