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Title: High Fidelity Operation of Si/SiGe Spin Qubit Devices
Authors: Mills, Adam
Advisors: Petta, Jason R
Contributors: Physics Department
Keywords: quantum computing
spin qubit
Subjects: Physics
Issue Date: 2023
Publisher: Princeton, NJ : Princeton University
Abstract: While the excitement of quantum computing has already managed to grab headlines and captivate people across backgrounds and disciplines, there is still a long way to go before it is ready to deliver on many of its big promises. To realize a general purpose quantum computer capable of solving complex problems better than their classical counterparts, we need to develop a technology that can scale to many qubits all operating with high fidelity. Some qubit technologies have had a lot of success scaling to a few tens of qubits, but there is no clear path to reaching thousands or millions of qubits. Semiconductor-based spin-qubits have the potential to leverage the industry-grade fabrication used to produce today's classical computers and scale to large quantum processing units capable of hosting thousands of qubits in a small area. In this thesis, we explore the challenges associated with scaling silicon spin-qubit devices and controlling them with high fidelity.We begin by exploring the device tuning and experimental controls required to achieve operation of a nine-quantum-dot array. Then we discuss computer-automated tuning routines developed during these experiments that help make operating large scale quantum dot devices easier. After developing high precision controls for the quantum dot arrays, we turn our focus to optimizing single- and two-qubit gate operations as well as state preparation and measurement (SPAM) fidelity.We show that with careful setup of the measurement and control circuitry in combination with strict balancing of readout parameters, we can achieve measurement visibility greater than 99\%. Furthermore, with optimized control pulses for single- and two-qubit gates we can perform single qubit rotations with fidelity exceeding 99.95\% and two qubit entangling gates with fidelity exceeding 99.8\%. These results are competitive with advanced qubit platforms, such as superconducting qubits, and demonstrate that quantum processing units based on silicon spin-qubits have potential to be a leading technology in the race to build a large-scale quantum computer.
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Physics

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