High Quality Content by WIKIPEDIA articles! In quantum mechanics a coherent state is the specific quantum state of the quantum harmonic oscillator whose dynamics most closely resembles the oscillating behaviour of a classical harmonic oscillator. It was the first example of quantum dynamics when Erwin Schrodinger derived it in 1926 while searching for solutions of the Schrodinger equation that satisfy the correspondence principle. The quantum harmonic oscillator and hence, the coherent states, arises in the quantum theory of a wide range of physical systems For instance, a coherent state describes the oscillating motion of the particle in a quadratic potential well (for an early reference, see e.g. Schiff's textbook ). These states, defined as eigenvectors of the lowering operator and forming an overcomplete family, were introduced in the early papers of John R. Klauder, e.g. . In the quantum theory of light (quantum electrodynamics) and other bosonic quantum field theories,...

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