Optimizing adiabaticity in quantum mechanics

Abstract

A condition on the Hamiltonian of a time-dependent quantum mechanical system is derived which, if satisfied, implies optimal adiabaticity (defined below). The condition is expressed in terms of the Hamiltonian and in terms of the evolution operator related to it. Since the latter depends in a complicated way on the Hamiltonian, it is not yet clear how the condition can be used to extract useful information about the optimal Hamiltonian. The condition is tested on an exactly-soluble time-dependent problem (a spin in a magnetic field), where perfectly adiabatic evolution can be easily identified.

5 pages, 2 figures

References in corpus (4)

• Bounds for the adiabatic approximation with applications to quantum computation
• Quantum Adiabatic Brachistochrone
• Validity of the Adiabatic Approximation
• Adiabatic approximation in the second quantized formulation

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• Evaluation of the importance of spin-orbit couplings in the nonadiabatic quantum dynamics with quantum fidelity and with its efficient "on-the-fly" ab initio semiclassical approximation