Methods for Measuring Magnetic Flux Crosstalk between Tunable Transmons

被引：26

作者：

Abrams, Deanna M. ^{[1
]}

Didier, Nicolas ^{[1
]}

Caldwell, Shane A. ^{[1
]}

Johnson, Blake R. ^{[1
]}

Ryan, Colm A. ^{[1
]}

机构：

[1] Rigetti Comp, 2919 Seventh St, Berkeley, CA 94710 USA

来源：

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

关键词：

QUANTUM SUPREMACY;

D O I：

10.1103/PhysRevApplied.12.064022

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In the gate model of quantum computing, a program is typically decomposed into a sequence of 1- and 2-qubit gates that are realized as control pulses acting on the system. A key requirement for a scalable control system is that the qubits are addressable-that control pulses act only on the targeted qubits. The presence of control crosstalk makes this addressability requirement difficult to meet. To provide metrics that can drive the requirements for decreasing crosstalk, we present three measurements that directly quantify the dc and ac flux crosstalk present between tunable transmons, with sensitivities as fine as 0.001%. We develop the theory to connect ac-flux-crosstalk measures to the infidelity of a parametrically activated two-qubit gate. We use quantum process tomography in the presence of crosstalk to provide an empirical study of the effects of crosstalk on two-qubit-gate fidelity.

引用

页数：11

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