Diabatic ion cooling by phonon swapping during controlled collision
Hoi-Kwan Lau · Physical Review A · 2014
I propose a method to remove the axial motional excitation from an ion qubit within a few oscillation periods of a harmonic trap without the need for laser illumination. The principle is to prepare another coolant ion in its motional ground state, and then apply a phonon beam splitter to swap the motional state between the ions without affecting the internal state. This method requires only the precise control of the trapping potential, thus its performance does not suffer from the limitations of current laser-cooling schemes. With sufficient coolant ions preprepared, this method can rapidly recool ion qubits during quantum information processing.