Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Discrete amplitude

Discrete amplitudes


When the set X is discrete (see above), vectors represented with the Hilbert space L2(X) are just column vectors composed of "amplitudes" and indexed by X. These are sometimes referred to as wave functions of a discrete variable xX. Discrete dynamical variables are used in such problems as a particle in an idealized reflective box and quantum harmonic oscillator. Components of the vector will be denoted by ψ(x) for uniformity with the previous case; there may be either finite of infinite number of components depending on the Hilbert space. In this case, if the vector has the norm 1, then |ψ(x)|2 is just the probability that the quantum system resides in the state x. It defines a discrete probability distribution on X.

|ψ(x)| = 1 if and only if |x is the same quantum state as . ψ(x) = 0 if and only if |x and are orthogonal (see inner product space). Otherwise the modulus of ψ(x) is between 0 and 1.

A discrete probability amplitude may be considered as a fundamental frequency[citation needed] in the Probability Frequency domain (spherical harmonics) for the purposes of simplifying M-theory transformation calculations.

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