Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions

被引：90

作者：

Collodo, Michele C. ^{[1
]}

Herrmann, Johannes ^{[1
]}

Lacroix, Nathan ^{[1
]}

Andersen, Christian Kraglund ^{[1
]}

Remm, Ants ^{[1
]}

Lazar, Stefania ^{[1
]}

Besse, Jean-Claude ^{[1
]}

Walter, Theo ^{[1
]}

Wallraff, Andreas ^{[1
,2
]}

Eichler, Christopher ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland

[2] Swiss Fed Inst Technol, Quantum Ctr, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 24期

基金：

欧盟地平线“2020”; 瑞士国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.125.240502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High fidelity two-qubit gates exhibiting low cross talk are essential building blocks for gate-based quantum information processing. In superconducting circuits, two-qubit gates are typically based either on rf-controlled interactions or on the in situ tunability of qubit frequencies. Here, we present an alternative approach using a tunable cross-Kerr-type ZZ interaction between two qubits, which we realize with a flux-tunable coupler element. We control the ZZ-coupling rate over 3 orders of magnitude to perform a rapid (38 ns), high-contrast, low leakage (0.14 +/- 0.24%) conditional phase CZ gate with a fidelity of 97.9 +/- 0.7% as measured in interleaved randomized benchmarking without relying on the resonant interaction with a noncomputational state. Furthermore, by exploiting the direct nature of the ZZ coupling, we easily access the entire conditional phase gate family by adjusting only a single control parameter.

引用

页数：5

共 55 条

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