Image (IMAGE) Science China Press Caption The authors exploit the technique of parametric driving to add external periodic modulations to the corresponding Hamiltonian parameters: (a) and (b) correspond to the linear parameters modulation, while (c) corresponds to the elliptical parameters modulation. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.