Circuit-QED based time-averaged dispersive readout of a semiconductor charge qubit
Ting Chun Lin, Si‐Si Gu, Yong-Qiang Xu, Shun-Li Jiang, Ning Wang, Bao‐Chuan Wang, Hai-Ou Li, Gang Cao, Guo‐Ping Guo · Applied Physics Letters · 2022
Maturing hybrid circuit quantum electrodynamics architectures composed of semiconductor quantum dots and on-chip microwave resonators promise an effective approach for quantum nondemolition readouts in semiconductor systems. Here, we study quantum coherence in a semiconductor charge qubit coupled with a high-impedance resonator. The qubit is controlled by a periodic pulse sequence, and a dispersive measurement is performed by measuring the time-averaged resonator response. From the Rabi oscillation and Ramsey fringe measurements, the coherence time of the charge qubit is determined as T2, Rabi ≈2.7 ns and T2, Ramsey ≈3.5 ns. Compared with the time-resolved (pulsed) measurement, this time-averaged dispersive measurement process eliminates the limitation caused by the resonator response time, enabling a high repetition rate of the pulse sequence in the experiments.