자료유형  

 학위논문

Control Number  

0017164123

International Standard Book Number  

9798346759683

Dewey Decimal Classification Number  

530.1

Main Entry-Personal Name  

Feldman, Mayer Martin.

Publication, Distribution, etc. (Imprint  

[S.l.] : Princeton University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

117 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

General Note  

Advisor: Lyon, Stephen A.

Dissertation Note  

Thesis (Ph.D.)--Princeton University, 2024.

Summary, Etc.  

요약Quantum computing with electron spins requires the precise manipulation and detection of the electron charge state. Electrons on helium has lacked in this regard, opting to use deep channel, micron sized gates to address electrons while utilizing exotic methods for electron sensing. This thesis focuses on the feasibility of trapping and controlling electrons in submicron quantum dots, developing an all-electrical cryogenic amplifier circuit for electron sensing, transporting small packets of electrons over thin helium films, and measuring the spin degree of freedom of 109 spins over superfluid helium.The first portion of the thesis describes an experiment exploring the use of an array of 750,000 dual layer lithographically defined 200 nanometer quantum dots to trap electrons. We find that these quantum dots can support 10s of electrons but also acknowledge that a change in device structure needs to be made to allow for more experimental repeatability. In the end, this experiment highlighted the need to transition to thin film devices and more sensitive measurement techniques. The second portion of this thesis focuses on a novel device design that allows for a gentle transition between thick and thin helium films. The use of a smooth amorphous resistive metal allows us to drive electrons across the thin helium surface with reasonable voltages; and by integrating this with our take on a cryogenic amplifier circuit using High Electron Mobility Transistors, we can measure the mobilities of small packets of electrons. We find that these results are in good agreement with previous measurements of mobilities of many (106) electrons over bulk helium films at the temperatures we work in.The last portion of this thesis details our attempt to measure the spin coherence and lifetimes of electrons floating on helium using a 3D Cavity. The complexities associated with integrating these two wildly different systems together required a novel approach to sample motion at cryogenic temperatures. We detail the thought process and implementation of this new setup that preserves over 95% of 2 inches of room temperature motion at cryogenic temperatures.

Subject Added Entry-Topical Term  

Quantum physics.

Subject Added Entry-Topical Term  

Condensed matter physics.

Subject Added Entry-Topical Term  

Electrical engineering.

Subject Added Entry-Topical Term  

Computational physics.

Index Term-Uncontrolled  

Electron spins

Index Term-Uncontrolled  

Electrons on helium

Index Term-Uncontrolled  

Quantum computing

Index Term-Uncontrolled  

Quantum information

Index Term-Uncontrolled  

High Electron Mobility Transistors

Added Entry-Corporate Name  

Princeton University Physics

Host Item Entry  

Dissertations Abstracts International. 86-06B.

Electronic Location and Access  

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Control Number  

joongbu:658623