Adjective
quantum mechanical (not comparable)
Of or pertaining to quantum mechanics.
quantum-mechanical (not comparable)
Alternative form of quantum mechanical
quantum-mechanical
Because of recent improvements in the accuracy of theoretical predictions based on large scale ab initio quantum mechanical calculations, meaningful comparisons between theoretical and experimental findings have become possible. Yuan T. Lee
But I don't actually adopt the point of view that our subjective impression of free will, which is a kind of indeterminacy behavior, comes from quantum mechanical indeterminacy. Murray Gell-Mann
According to this interpretation, the purpose of a quantum-mechanical theory is to predict the relative probabilities of various alternative histories (for example, of a particle). Source: Internet
An example is the well-known calculation of the tiny first-order quantum-mechanical correction to the classical Newtonian gravitational potential between two masses. Source: Internet
Classical field theory does not, however, account for the quantum-mechanical aspects of such physical phenomena. Source: Internet
BCS is able to give an approximation for the quantum-mechanical many-body state of the system of (attractively interacting) electrons inside the metal. Source: Internet