Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits

被引：39

作者：

Blumoff, Jacob Z. ^{[1
]}

Pan, Andrew S. ^{[1
]}

Keating, Tyler E. ^{[1
]}

Andrews, Reed W. ^{[1
]}

Barnes, David W. ^{[1
]}

Brecht, Teresa L. ^{[1
]}

Croke, Edward T. ^{[1
]}

Euliss, Larken E. ^{[1
]}

Fast, Jacob A. ^{[1
]}

Jackson, Clayton A. C. ^{[1
]}

Jones, Aaron M. ^{[1
]}

Kerckhoff, Joseph ^{[1
]}

Lanza, Robert K. ^{[1
]}

Raach, Kate ^{[1
]}

Thomas, Bryan J. ^{[1
]}

Velunta, Roland ^{[1
]}

Weinstein, Aaron J. ^{[1
]}

Ladd, Thaddeus D. ^{[1
]}

Eng, Kevin ^{[1
]}

Borselli, Matthew G. ^{[1
]}

Hunter, Andrew T. ^{[1
]}

Rakher, Matthew T. ^{[1
]}

机构：

[1] HRL Labs LLC, 3011 Malibu Canyon Rd, Malibu, CA 90265 USA

来源：

PRX QUANTUM | 2022年 / 3卷 / 01期

关键词：

ELECTRON-SPIN; COULOMB-BLOCKADE; COMPUTATION; OSCILLATIONS; TRANSPORT;

D O I：

10.1103/PRXQuantum.3.010352

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate rapid high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. Fast measurement integration (980-ns) and initialization (approximately 300-ns) operations are performed with all-electrical baseband control. We emphasize a leakage-sensitive joint initialization and measurement metric, developed in the context of exchange-only qubits but applicable more broadly, and report an infidelity of 2.5 +/- 0.5 x 10(-3). This result is enabled by a high-valley-splitting heterostructure, initialization at the two- to three-electron charge boundary, and careful assessment and mitigation of T-1 during spin-to-charge conversion. The ultimate fidelity is limited by a number of comparably important factors and we identify clear paths toward further improved fidelity and speed. Along with an observed single-qubit randomized benchmarking error rate of 1.7 x 10(-3), this work demonstrates initialization, control, and measurement of Si/SiGe triple-dot qubits at fidelities and durations that are promising for scalable quantum information processing.

引用

页数：15

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