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Increasing Lifetimes of Superconducting Qubits.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Increasing Lifetimes of Superconducting Qubits./
Author:	Place, Alexander Patrick McCormick.
Description:	1 online resource (159 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
Contained By:	Dissertations Abstracts International84-04B.
Subject:	Quantum physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29318742click for full text (PQDT)
ISBN:	9798352691267

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

Increasing Lifetimes of Superconducting Qubits. - 1 online resource (159 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798352691267Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Superconducting quantum circuitsIndex Terms--Genre/Form:

542853
Electronic books.

Increasing Lifetimes of Superconducting Qubits.
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500 $a Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
500 $a Advisor: Houck, Andrew A.
502 $a Thesis (Ph.D.)--Princeton University, 2022.
504 $a Includes bibliographical references
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.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Quantum physics. $3 726746
650 4 $a Applied physics. $3 3343996
650 4 $a Materials science. $3 543314
653 $a Superconducting quantum circuits
653 $a Resonator
653 $a Tantalum
653 $a Transmon
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653 $a Qubit
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773 0 $t Dissertations Abstracts International $g 84-04B.
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