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3 - Basic Concepts of Quantum Mechanics

Published online by Cambridge University Press:  10 November 2022

Mauro Nisoli
Mauro Nisoli
Affiliation:
Politecnico di Milano
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Summary

Basic concepts of quantum mechanics: Schroedinger equation; Dirac notation; the energy representation; expectation value; Hermite operators; coherent superposition of states and motion in the quantum world; perturbation Hamiltonian. Time-dependent perturbation theory: harmonic perturbation. Transition rate: Fermi’s golden rule. The density matrix; pure and mixed states. Temporal dependence of the density operator: von Neuman equation. Randomizing Hamiltonian. Longitudinal and transverse relaxation times. Density matrix and entropy.

Keywords

Quantum mechanicsQuantum operatorsPerturbation theoryDensity matrixCoherence
Type
Chapter
Information
Semiconductor Laser Photonics , pp. 69 - 97
Publisher: Cambridge University Press
Print publication year: 2022

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