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I t seems worthwhile, therefore, to review coinnionly encountered "representations" of the time dependence of operators, quantum states, and ensembles of quantum states. The optical Blocli equations present somewhat different forms depending on the representation in which they are expressed. ) are independent of time. In the Heisenberg representation all the explicit time dependence resides in the operators and the state functions are time-independent. The interaction representation is a hybrid of the Schrodinger and Heisenberg representations appropriate for Haniiltonians of the form where is a time-independent Haniiltonian of the unperturbed system and V ( t ) is a time-dependent coupling interaction, often a perturbing oscillatory field.
Are independent of time. In the Heisenberg representation all the explicit time dependence resides in the operators and the state functions are time-independent. The interaction representation is a hybrid of the Schrodinger and Heisenberg representations appropriate for Haniiltonians of the form where is a time-independent Haniiltonian of the unperturbed system and V ( t ) is a time-dependent coupling interaction, often a perturbing oscillatory field. 35 CHAPTER 3. THE OPTICAL BLOCH EQUATIONS Time evolution operator Recall froin elementary quantuin mechanics the time evolution operator, U ( t ,t o ) , which acts on the ket space of a quantum state to trarisforni it froin initial time t o to a later time t : .
1, introduce the important idea of polarization and susceptibility as the result of a collection of driven oscillating dipoles. The OBEs including spontaneous emission are then written down, and their steady-state solutions discussed. Dissipative processes always broaden transition lines, and we will discuss various broadening mechanisms in the last section. 2 Coupled differential equations Now that we have established the language of density matrix theory, let us consider first the density matrix of our two-level atom in a pure state (and without spontaneous emission) in the (Q1, Q 2 ) representation.