Find qubit transition frequency and anharmonicity
Qubit Frequency
5.200 GHz
Anharmonicity
-280 MHz
Linewidth
2.0 MHz
This measurement identifies the qubit's |g⟩→|e⟩ transition frequency by sweeping a weak probe tone. The anharmonicity (negative for transmons) separates the |e⟩→|f⟩ transition, enabling selective addressing of the qubit without exciting higher levels. This is crucial for defining accurate pi-pulses and avoiding leakage errors in quantum gates.