Fast and stable manipulation of a charged particle in a Penning trap
  We propose shortcuts to adiabaticity which achieve fast and stable control of the state of a charged particle in an electromagnetic field. In particular we design a non-adiabatic change of the magnetic field strength in a Penning trap which changes the radial spread without final excitations. We apply a streamlined version of the fast-forward formalism as well as an invariant based inverse engineering approach. We compare both methods and examine their stability. 
A. Kiely, J. P. L. McGuinness, J. G. Muga, A. Ruschhaupt
quant-ph