2017/12/19 by E. J. Zak, Emil J. Zak, Zak, Emil J.
Chemistry · Physics and Astronomy · #34H05 #34K35 #49N05 #65Kxx #81Q05 #81Q93 #93Cxx #FOS: Physical sciences #Quantum Physics (quant-ph) #Quantum optics and atomic interactions #Spectroscopy and Laser Applications #Spectroscopy and Quantum Chemical Studies #msc:34H05 #msc:34K35 #msc:49N05 #msc:65Kxx #msc:81Q05 #msc:81Q93 #msc:93Cxx #quant-ph
paper · pdf · doi:10.48550/arxiv.1712.06998
arxiv created 2017/12/19 · openalex publication_date 2017/12/19 · arxiv updated 2017/12/20 · openalex created_date 2018/01/05 · openalex updated_date 2026/07/28
The present paper reports on results of quantum dynamics calculations for Stark-chirp rapid-adiabatic passage (SCRAP) in two-level systems with electric fields computed with the optimal control theory. The Pontryagin maximum principle is used to determine the robust optimal control fields in the presence of time-varying and spatially-inhomogeneous perturbing electric fields. The concept of a non-adiabatic correction to the Bloch vector dynamics is introduced and discussed. The existence of a non-zero geometric phase is proved for certain adiabatic paths, which correspond to the complete population return in the rapid-adiabatic passage. A connection is shown between the geometric phase and a measure of the non-adiabatic effects in the time evolution of the state vector during SCRAP. Different cost functionals used in the optimal control scheme are shown to correlate with different topologies of the paths followed by the parameters of the Hamiltonian, which tightly relates to the values of the geometric phase acquired by the adiabatic wavefunction.