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Spin and Charge Qubits in SiliconSilicon Germanium Quantum dots.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spin and Charge Qubits in SiliconSilicon Germanium Quantum dots./
Author:	Shi, Zhan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2013,
Description:	88 p.
Notes:	Source: Dissertations Abstracts International, Volume: 75-05, Section: B.
Contained By:	Dissertations Abstracts International75-05B.
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596724
ISBN:	9781303439117

Spin and Charge Qubits in SiliconSilicon Germanium Quantum dots.
Shi, Zhan.

Spin and Charge Qubits in SiliconSilicon Germanium Quantum dots. - Ann Arbor : ProQuest Dissertations & Theses, 2013 - 88 p.

Source: Dissertations Abstracts International, Volume: 75-05, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2013.

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

In this thesis, we study the spin and charge properties of a Si/SiGe double dot system and demonstrate coherent quantum control of few-electron quantum states. We use a pulsed magneto-spectroscopy method to measure the excited state spectrum of a Si/SiGe quantum dot containing two valence electrons. We extract the singlet-triplet energy splitting, an essential parameter for spin qubits, and we present calculations showing the data are consistent with a spectrum in which the first excited state of the dot is a valley-orbit state. We then propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. The proposed hybrid qubit consists of a double quantum dot with two electrons in one dot and one electron in the other. The hybrid qubit formed from three electrons in a double quantum dot has potential for great speed due to the presence of level crossings where the qubit becomes charge-like. Thus, as a stepping stone, we demonstrate coherent manipulations in a three-electron charge qubit. Finally, we demonstrate fast coherent manipulation of three-electron states in a double quantum dot as progress towards the implementation of the pulse-gated hybrid qubit. We demonstrate that tailored pulse sequences can be used to induce coherent rotations between 3-electron quantum states.

ISBN: 9781303439117Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Charge qubits

Spin and Charge Qubits in SiliconSilicon Germanium Quantum dots.
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300 $a 88 p.
500 $a Source: Dissertations Abstracts International, Volume: 75-05, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Eriksson, Mark A.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2013.
506 $a This item must not be sold to any third party vendors.
520 $a In this thesis, we study the spin and charge properties of a Si/SiGe double dot system and demonstrate coherent quantum control of few-electron quantum states. We use a pulsed magneto-spectroscopy method to measure the excited state spectrum of a Si/SiGe quantum dot containing two valence electrons. We extract the singlet-triplet energy splitting, an essential parameter for spin qubits, and we present calculations showing the data are consistent with a spectrum in which the first excited state of the dot is a valley-orbit state. We then propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. The proposed hybrid qubit consists of a double quantum dot with two electrons in one dot and one electron in the other. The hybrid qubit formed from three electrons in a double quantum dot has potential for great speed due to the presence of level crossings where the qubit becomes charge-like. Thus, as a stepping stone, we demonstrate coherent manipulations in a three-electron charge qubit. Finally, we demonstrate fast coherent manipulation of three-electron states in a double quantum dot as progress towards the implementation of the pulse-gated hybrid qubit. We demonstrate that tailored pulse sequences can be used to induce coherent rotations between 3-electron quantum states.
590 $a School code: 0262.
650 4 $a Condensed matter physics. $3 3173567
653 $a Charge qubits
653 $a Quantum dots
653 $a Silicon germanium
653 $a Spin qubits
690 $a 0611
710 2 $a The University of Wisconsin - Madison. $b Physics. $3 2094813
773 0 $t Dissertations Abstracts International $g 75-05B.
790 $a 0262
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596724