eigenstateiksi
In quantum mechanics, an eigenstate is a particular state of a quantum system that, when a measurement of a certain observable is performed, yields a definite, unchanging result. This result is known as the eigenvalue. Mathematically, an eigenstate is an eigenvector of an operator corresponding to a physical observable. When the operator acts on its eigenstate, the result is simply the eigenstate multiplied by a scalar constant, which is the eigenvalue.
For example, consider the observable of energy. The eigenstates of the energy operator are called stationary
However, if a quantum system is not in an eigenstate of an observable, a measurement will yield