  By driving a 3D transmon with microwave fields, we generate an effective
avoided energy-level crossing. Then we chirp microwave frequency, which is
equivalent to driving the system through the avoided energy-level crossing by
sweeping the avoided crossing. A double-passage chirp produces
Landau-Zener-St\"uckelberg-Majorana interference that agree well with the
numerical results. Our method is fully applicable to other quantum systems that
contain no intrinsic avoided level crossing, providing an alternative approach
for quantum control and quantum simulation.
