What is harmitian operator

A Hermitian operator is a type of linear operator in quantum mechanics that has the property that it is equal to its own conjugate transpose. In other words, if H is a Hermitian operator, then the complex conjugate of the matrix representation of H is equal to its transpose.

This property of Hermitian operators is important in quantum mechanics because it guarantees that the eigenvalues (possible outcomes of a measurement) are real, and the eigenvectors (states of the system) are orthogonal. Additionally, Hermitian operators have the useful property that their expectation values are always real.

In quantum mechanics, physical observables (such as position or momentum) are represented by Hermitian operators. The mathematical properties of Hermitian operators reflect the physical properties of observables, making them a fundamental concept in quantum mechanics.