In 1982 R. Feynman stated "I want to talk about the possibility that there is to be an exact simulation, that the computer will do exactly the same as nature." in his visionary article "Simulating Physics with Computers." Computer simulations, to the best of our knowledge, applying the known rules of physics to computer-modelled particle, is an exact one-to-one mapping to reality, such that experimental and virtual data, for all practical purposes, are indistinguishable. The remaining discrepancy, between experiment and computer simulations, is an ongoing battle the computational chemists are convincingly winning inch by inch. In the not too distant future computer simulations will be a fully adequate alternative to experiments, at which point questions like, cost efficiency, environmental considerations, or other aspects will be the ground for the choice between theory and experiment. Quantum computers may offer the way forward as they are known to simulate matter exactly if a suitable input state is provided . Enormous progress in the field has led to current experiments involving several qubits and simulating molecules as large as BeH 2 . 4. The Matter Computer Let us now provide the complete 1957 quote of Per-Olov Löwdin mentioned in section 2: "There seems to be a rather long way to go before we reach the mathematical goal of quantum chemistry, which is to be able to predict accurately the properties of a hypothetic polyatomic molecule before it has been synthesized in the laboratories. The aim is also to obtain such knowledge of the electronic structure of matter that one can construct new substances having properties of particular value to mankind. To learn to think in terms of electrons and their quantum mechanical behaviors probably of greater technical importance than we can now anticipate."