Fig. 3: Breaking the trade-off between the fast control and long lifetime of the qubit with the JQF. | Nature Communications

Fig. 3: Breaking the trade-off between the fast control and long lifetime of the qubit with the JQF.

From: Breaking the trade-off between fast control and long lifetime of a superconducting qubit

Fig. 3

The red and blue dots are the experimental results with and without the JQF, respectively. The black lines are the theoretical fits. a Qubit population in the excited state as a function of the delay time between the π pulse and the readout. b Decay times as a function of the JQF–qubit detuning. The orange and cyan circles depict the relaxation time (T1) and the Hahn-echo coherence time (\({T}_{2}^{{\rm{E}}}\)), respectively. The solid lines are the numerically simulated results (see more details in Supplementary Notes 3 and 4). The horizontal dashed lines are those in the absence of the JQF. c Qubit population in the excited state as a function of the duration of a square control pulse with Gaussian edges. d Rabi frequency as a function of the JQF–qubit detuning. The green circles are the observed Rabi frequency in the presence of the JQF, and the orange circles are the conventional upper bound of the Rabi frequency for the given drive power, which is calculated as \(2\sqrt{\dot{n}/{T}_{1}}\). The error bars represent standard errors.

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