Three Basic Principles of Quantum Mechanics
  1. The probability P of any event in an ideal experiment is given by the square of the absolute value of complex number which is called the probability amplitude (or more concisely "Amplitude") :
     
                       P  =  ½f½2  =  φ · φ*
     
  2. If there are few possible events then we can apply the "superposition principle" (linear combination):
     
                             f  =  φ1 + φ2
                       P = ½f½2 = ½f1 + φ2½2             ←  Interference
     
  3. If one carries out an experiment in which it is possible to choose multiple outcomes then the total probability is:
     
                      P = P1 + P2  = ½f1½2 + ½f2½2    ←  no Interference

 
Contrary to the classical description of matter, we can only talk about the event probabilities in quantum mechanics.
 

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