High-Fidelity Entangled Bell States via Shortcuts to Adiabaticity
  We present a couple of protocols based on shortcut to adiabaticity techniques for rapid generation of robust entangled Bell states in a system of two two-state systems. Our protocols rely on the so-called transitionless quantum driving (TQD) algorithm and Lewis-Riesenfeld invariant (LRI) method. Both TQD and LRI methods result in high fidelity in population transfer.Our study shows that it is possible to prepare an entangled state in infinitely short time without losing robustness and efficiency. 
Koushik Paul and Amarendra K. Sarma
quant-ph cond-mat.mes-hall physics.atom-ph