國立虎尾科技大學 |

Increasing Lifetimes of Superconducting Qubits.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Increasing Lifetimes of Superconducting Qubits./
作者:	Place, Alexander Patrick McCormick.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	159 p.
附註:	Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
Contained By:	Dissertations Abstracts International84-04B.
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29318742
ISBN:	9798352691267

Increasing Lifetimes of Superconducting Qubits.
Place, Alexander Patrick McCormick.

Increasing Lifetimes of Superconducting Qubits. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 159 p.

Source: Dissertations Abstracts International, Volume: 84-04, Section: B.

Thesis (Ph.D.)--Princeton University, 2022.

This item must not be sold to any third party vendors.

Superconducting quantum circuits are a promising platform for quantum computation. The building block for most quantum processors is a qubit (quantum bit) which can store information in a superposition of two states. Superconducting qubits are lithographically defined from metals, often niobium or aluminum. However, these devices have limited use because the information they store decays before most useful computations can take place. In this thesis we explore the cause of these losses. Specifically, we employ tantalum as the capacitor pad of a two-dimensional transmon qubit and find lifetimes and coherence times with dynamical decoupling over 300 us. We then switch to a resonator geometry to probe tantalum materials properties. We develop a power and temperature dependent measurement to quantify sources of decay. We find our resonators are primarily limited by two-level system loss at materials interfaces. Finally we employ this resonator characterization method to determine the effects of processing treatments and new packages on resonator decay, showing a buffered-oxide etch before measurement reduces two-level system loss.

ISBN: 9798352691267Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

Superconducting quantum circuits

Increasing Lifetimes of Superconducting Qubits.
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500 $a Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
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502 $a Thesis (Ph.D.)--Princeton University, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a Superconducting quantum circuits are a promising platform for quantum computation. The building block for most quantum processors is a qubit (quantum bit) which can store information in a superposition of two states. Superconducting qubits are lithographically defined from metals, often niobium or aluminum. However, these devices have limited use because the information they store decays before most useful computations can take place. In this thesis we explore the cause of these losses. Specifically, we employ tantalum as the capacitor pad of a two-dimensional transmon qubit and find lifetimes and coherence times with dynamical decoupling over 300 us. We then switch to a resonator geometry to probe tantalum materials properties. We develop a power and temperature dependent measurement to quantify sources of decay. We find our resonators are primarily limited by two-level system loss at materials interfaces. Finally we employ this resonator characterization method to determine the effects of processing treatments and new packages on resonator decay, showing a buffered-oxide etch before measurement reduces two-level system loss.
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