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Designer Quantum Materials

Srinivasa, Vanita (2012) Designer Quantum Materials. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Srinivasa, Vanitavas9@pitt.eduVAS9
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLevy, Jeremyjlevy@pitt.eduJLEVY
Committee MemberWaldeck, David H.
Committee MemberGriffiths, Robert B.
Committee MemberDutt, M. V. Gurudev
Committee MemberSwanson, 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


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