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- W4376111967 abstract "Explicitly time-dependent Hamiltonians are ubiquitous in applications of quantum theory. It is therefore necessary to solve the time-dependent Schrödinger equation directly. The system’s dynamics is associated with a unitary time-evolution operator (a propagator), formally given as an infinite Dyson series. Time-dependent observables are invariant under unitary time-dependent transformations, where it is sometimes useful to transform the time-evolution from the states into the corresponding operators. This is carried out in part (in full) by transforming to the interaction (Heisenberg) picture. The corresponding equations of motion for the time-dependent operators are introduced. For quadratic potential energy functions, the time evolution of quantum expectation values coincides with the corresponding classical dynamics. This is demonstrated and analyzed in detail for Gaussian wave packets and a coherent state. Finally, we derive exact and approximate expressions for time-dependent transition probabilities and transition rates between quantum states. The validity of time-dependent perturbation theory is analyzed by comparison to exact dynamics." @default.
- W4376111967 created "2023-05-12" @default.
- W4376111967 date "2023-06-01" @default.
- W4376111967 modified "2023-10-14" @default.
- W4376111967 title "Quantum Dynamics" @default.
- W4376111967 doi "https://doi.org/10.1017/9781108877787.016" @default.
- W4376111967 hasPublicationYear "2023" @default.
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