Fig. 1. The power change scan S₂₁ of 3D Transmon: (a) Intensity graph of S₂₁; (b) partial S₂₁ curve.

Fig. 2. 3D Transmon measurement system.

Fig. 3. The S₂₁ curve for the qubits excited by continuously microwave.

Fig. 4. Time sequence diagram of coherent oscillation measured by network analyzer.

Fig. 5. Amplitude and phase diagram of 3D transmon coherent oscillation measured by network analyzer

Fig. 6. (a) Intensity diagram of coherent oscillation at different microwave power; (b) relationship between coherent oscillation and microwave excitation amplitude.

Fig. 7. Rabi oscillation by Jaynes-Cummings method based on data acquisition card.