We theoretically propose and experimentally implement a method of measuring a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. The separation of the bosonic states corresponding to different qubit states begins essentially immediately at maximum rate, leading to a speedup in the measurement protocol. Also the bosonic mode can be simultaneously driven to optimize measurement speed and fidelity. We experimentally test this measurement protocol using a superconducting qubit coupled to a resonator mode. For a certain measurement time, we observe that the conventional dispersive readout yields close to 100% higher average measurement error than our protocol. Finally, we use an additional resonator drive to leave the resonator state to vacuum if the qubit is in the ground state during the measurement protocol. This suggests that the proposed measurement technique may become useful in unconditionally resetting the resonator to a vacuum state after the measurement pulse.

中文翻译：

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多通道驱动的Qubit测量

我们从理论上提出并实验性地实现了一种通过驱使它接近色散耦合玻色子模式的频率来测量qubit的方法。对应于不同量子位状态的玻色状态的分离基本上立即以最大速率开始，从而导致测量协议的加速。同样，可以同时驱动bosonic模式，以优化测量速度和保真度。我们使用耦合到谐振器模式的超导量子位通过实验测试了该测量协议。对于一定的测量时间，我们观察到常规的色散读数比我们的协议高出近100％的平均测量误差。最后，如果在测量协议中量子位处于基态，则使用附加的谐振器驱动器将谐振器状态保持为真空。