Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons
Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons
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DOI：
10.1103/physrevapplied.12.064013
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发表时间：
2019-05
影响因子：
4.6
通讯作者：
A. Patterson;J. Rahamim;T. Tsunoda;P. Spring;S. Jebari;K. Ratter;M. Mergenthaler;G. Tancredi;B. Vlastakis;M. Esposito;P. Leek
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文献类型：
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作者：
A. Patterson;J. Rahamim;T. Tsunoda;P. Spring;S. Jebari;K. Ratter;M. Mergenthaler;G. Tancredi;B. Vlastakis;M. Esposito;P. Leek
量子计算需要精确控制量子系统的演化，通常通过在一组量子位上应用离散量子逻辑门。在这里，我们使用交叉共振相互作用来实现两个超导transmon量子比特之间具有直接静态色散耦合的门。我们演示了一种实用的校准程序来优化门，结合连续和重复门哈密顿层析成像，通过映射到微波控制参数逐步减少主要的双量子位相干误差。我们通过实验证明，该过程可以使$\hat{ZX}_{-\pi/2}$门具有保真度$F=97.0(7)\%$，并通过交错随机基准测试进行测量。我们在一个具有面外控制和读出的架构中展示了这一点，该架构很容易扩展到更大规模的量子电路。
Quantum computation requires the precise control of the evolution of a quantum system, typically through application of discrete quantum logic gates on a set of qubits. Here, we use the cross-resonance interaction to implement a gate between two superconducting transmon qubits with a direct static dispersive coupling. We demonstrate a practical calibration procedure for the optimization of the gate, combining continuous and repeated-gate Hamiltonian tomography with step-wise reduction of dominant two-qubit coherent errors through mapping to microwave control parameters. We show experimentally that this procedure can enable a $\hat{ZX}_{-\pi/2}$ gate with a fidelity $F=97.0(7)\%$, measured with interleaved randomized benchmarking. We show this in a architecture with out-of-plane control and readout that is readily extensible to larger scale quantum circuits.