Srinivasa, Vanita
(2012)
Designer Quantum Materials.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Spin-based quantum information processing relies on the ability to identify and coherently manipulate quantum bits (qubits) existing in nature in the form of spin-1/2 particles such as electrons. The work described in this thesis is based on an alternative perspective: that these spin-1/2 objects, together with their interactions, can be regarded as building blocks of a variety of “designer quantum materials” with features not present for isolated single spins. Theoretical proposals are presented for two classes of spin-based designer quantum materials relevant for quantum information transport and manipulation.
The first class of materials involves spin-1/2 networks coupled by spatially-varying exchange interactions, in which moving domain walls can produce topologically-stable “flying spin qubits,” and pairs of domain walls can be used to generate and transport Einstein-Podolsky-Rosen pairs of entangled qubits. The effective exchange between two domain-wall qubits can be tuned by adjusting the positions of the domain walls and can be ferromagnetic even when all spin-spin couplings are antiferromagnetic.
The second class of designer quantum materials consists of electron spins in quantum wires with spatially-varying spin-orbit coupling. The presence of the spin-orbit interaction introduces pseudo-Zeeman couplings of the electron spins to effective magnetic fields and further enhances the building-block toolset: by periodically modulating this spin-orbit coupling in space, it is possible to create the spatial analogue of spin resonance, without the need for any real magnetic fields. The mapping of time-dependent operations onto a spatial axis suggests a new mode for quantum information processing in which gate operations are encoded into the band structure of the material.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
| Creators | Email | Pitt Username | ORCID  |
|---|
| Srinivasa, Vanita | vas9@pitt.edu | VAS9 | |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | Levy, Jeremy | jlevy@pitt.edu | JLEVY | | | Committee Member | Waldeck, David H. | | | | | Committee Member | Griffiths, Robert B. | | | | | Committee Member | Dutt, M. V. Gurudev | | | | | Committee Member | Swanson, Eric S. | | | |
|
| Date: |
3 July 2012 |
| Date Type: |
Publication |
| Defense Date: |
3 February 2012 |
| Approval Date: |
3 July 2012 |
| Submission Date: |
13 February 2012 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
145 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Physics |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
spin physics, flying spin qubits, effective exchange interactions, spin-orbit interaction, quantum dots, quantum wires |
| Date Deposited: |
03 Jul 2012 15:27 |
| Last Modified: |
15 Nov 2016 13:56 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/11043 |
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