Question

Write three postulates of quantum mechanical model with diagram

Answer 1

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Quantum Mechanics is an axiomatic theory because it is well-grounded on few principles (from the Latin principium), or axioms (from the Greek, axios), or postulates (from the Latin postulatum), all of these words meaning the same thing: a truth which doesn’t need any further proof, because it is obvious by itself.

♦ The first postulate of Quantum Mechanics :

To every state of a physical system there is a function Ψ ascribed to and defining the state.

♦ The second postulate of Quantum Mechanics :

If $H_1$ is the Hilbert space associated with the physical system $S_1$ , and $H_2$ is the Hilbert space corresponding to the other physical system $S_2$, then the composite system $S_1$ + $S_2$ will be associated with the tensor product of the two Hilbert vector spaces $H_1$ ⊗ $H_2$

♦ The third postulate of Quantum Mechanics :

To every observable of a physical system is associated a self-adjoint (or Hermitian) operator allowing a complete set of riven functions.

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