Using non-ideal gates to implement universal quantum computing between uncoupled qubits

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Authors
Kumar, Preethika
Skinner, Steven R.
Advisors
Issue Date
2013-02
Type
Article
Keywords
Quantum , Gates , Ising , Universal , Linear nearest neighbor architecture , Controlled-NOT , Toffoli , Next-to-nearest-neighbor qubits
Research Projects
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Journal Issue
Citation
Kumar, Preethika; Skinner, Steven R. 2013. Using non-ideal gates to implement universal quantum computing between uncoupled qubits. Quantum Information Processing, v.12 no.2 pp.973-996
Abstract

In many physical systems, when implementing quantum gate operations unavoidable global and relative phases occur as by-products due to the internal structure of the governing Hamiltonian. To correct, additional phase rotation gates are used, which increases the computational overhead. Here, we show how these phase by-products can actually be used to our advantage by using them to implement universal quantum computing between qubits not directly coupled to each other. The gate operations, CNOT, Toffoli, and swap gates, require much less computational overhead than present schemes, and are achieved with fidelity greater than 99%. We then present a linear nearest-neighbor architecture that takes full advantage of the phase by-products, and we show how to implement gates from a universal set efficiently in this layout. In this scheme gate operations are realized by only varying a single control parameter per data qubit, and the ability to tune couplings is not required.

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Publisher
Springer
Journal
Book Title
Series
Quantum Information Processing;v.12 no.2
PubMed ID
DOI
ISSN
1570-0755
EISSN