Shortcut-to-adiabaticity for coupled harmonic oscillators

Abstract

High control in the preparation and manipulation of states is an experimental and theoretical important task in many quantum protocols. Shortcuts to adiabaticity methods allow to obtain desirable states of a adiabatic dynamics but in short time scales. In this work, the problem of considering this technique for two-coupled bosonic modes is addressed. By using symplectic transformations it is possible to decouple the modes and find the driving Hamiltonian that drives the system through a transitionless dynamics in a finite-time regime. Two paradigmatic interactions are discussed, the position-position and the magnetic field couplings. We also illustrate the finding in a concrete example where the nonadiabaticity degree is quantified in terms of the residual energy. Finally, it is shown that the driving Hamiltonian for each case contains local and global contributions, accounting for coherence in the energy basis and entanglement effects, respectively.