Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons

被引：50

作者：

Patterson, A. D. ^{[1
,2
]}

Rahamim, J. ^{[1
]}

Tsunoda, T. ^{[1
]}

Spring, P. A. ^{[1
]}

Jebari, S. ^{[1
]}

Ratter, K. ^{[1
]}

Mergenthaler, M. ^{[1
]}

Tancredi, G. ^{[1
]}

Vlastakis, B. ^{[1
]}

Esposito, M. ^{[1
]}

Leek, P. J. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Oxford Quantum Circuits, King Charles House, Oxford OX1 1JD, England

来源：

PHYSICAL REVIEW APPLIED | 2019年 / 12卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

Compendex;

D O I：

10.1103/PhysRevApplied.12.064013

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 stepwise reduction of dominant two-qubit coherent errors through mapping to microwave control parameters. We show experimentally that this procedure can enable a (ZX) over cap (-pi/2) gate with a fidelity F = 97.0(7)%, measured with interleaved randomized benchmarking. We show this in an architecture with out-of-plane control and readout that is readily extensible to larger-scale quantum circuits.

引用

页数：8

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