US government wants to have a useful quantum computer by 2028

The US government wants to get hold of a quantum computer good enough to contribute to scientific breakthroughs in just two years. It will use it to try to accelerate the research and development of new materials, pharmaceuticals and molecules useful in agriculture and manufacturing. Once a dream of theoretical physicists, quantum computers are now undoubtedly real, but have yet to prove unambiguously useful or to have broad commercial value. Their computational power depends on their size - how many components called qubits they comprise - and how reliable they are. Existing devices are still too small and too error-prone.