This is a generalization of the concept of an adjoint matrix (also known as a conjugate transpose, Hermitian conjugate, or Hermitian adjoint). In mathematics, a Hermitian matrix (or self-adjoint matrix) is a complex square matrix that is equal to its own conjugate transpose—that is, the element in the i-th Alternatives · Examples · Properties · Further properties. Now AT = => A is Hermitian (the ij-element is conjugate to the ji-element). Since A is Hermitian, we have AH = A = T. The diagonal elements of a Hermitian matrix.

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So does the ratio bewteen the vertical sides. The red circle is the unit circle.

Try to hermitian matrices P along the red circle and watch Q traces the green ellipse. In this figure, H is not hermitian matrices computed. Instead, U and D are displayed in the left, with U above D.

The signs may not match exactly as what you get from the result of eig H in octave. So hermitian matrices drag "a" and "b" around, watch how Q moves accordingly, and verify by substituting the new U and D in the above formula in octave.

Multiplication by an Hermitian matrix is just stretching the orthogonal components of a vector by constant factors in some rotation of the original hermitian matrices system.

Indeed, by definition which implies hermitian matrices edit ] Real-valued Hermitian matrices A real-valued Hermitian matrix is a real symmetric matrix and hence the theorems of the latter are special cases of theorems of hermitian matrices former.

This means that any Hermitian matrix can be diagonalised by a unitary matrix, all its entries have real values All the eigenvalues of Hermitian hermitian matrices are real. The following two theorems give useful and simple characterizations of the positivity of Hermitian matrices.

It is positive definite if and only if all of its eigenvalues are positive. Then A is Hermitian if and only hermitian matrices at least one of the following holds: Moreover, A is real and Hermitian i.

## Hermitian matrix | Quantiki

Hermitian matrices have found an important application in modern physics, as the representations of measurement operators in Heisenberg's version of quantum mechanics. To each observable parameter of a physical system there corresponds a Hermitian matrix whose eigenvalues are the possible values that can result from a measurement of that parameter, and whose eigenvectors are the corresponding states of the system hermitian matrices a measurement.

Since a measurement yields precisely one real value hermitian matrices leaves the system in precisely one of a set of mutually exclusive i.