Gatemon Benchmarking and Two-Qubit Operations

被引：73

作者：

Casparis, L. ^{[1
]}

Larsen, T. W. ^{[1
]}

Olsen, M. S. ^{[1
]}

Kuemmeth, F. ^{[1
]}

Krogstrup, P. ^{[1
]}

Nygard, J. ^{[1
,2
]}

Petersson, K. D. ^{[1
]}

Marcus, C. M. ^{[1
]}

机构：

[1] Univ Copenhagen, Niels Bohr Inst, Ctr Quantum Devices, Stn Copenhagen Q, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

[2] Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 15期

基金：

新加坡国家研究基金会;

关键词：

QUBIT; NANOWIRES;

D O I：

10.1103/PhysRevLett.116.150505

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent experiments have demonstrated superconducting transmon qubits with semiconductor nanowire Josephson junctions. These hybrid gatemon qubits utilize field effect tunability characteristic of semiconductors to allow complete qubit control using gate voltages, potentially a technological advantage over conventional flux-controlled transmons. Here, we present experiments with a two-qubit gatemon circuit. We characterize qubit coherence and stability and use randomized benchmarking to demonstrate single-qubit gate errors below 0.7% for all gates, including voltage-controlled Z rotations. We show coherent capacitive coupling between two gatemons and coherent swap operations. Finally, we perform a two-qubit controlled-phase gate with an estimated fidelity of 91%, demonstrating the potential of gatemon qubits for building scalable quantum processors.

引用

页数：5

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