Scalable quantum computation via local control of only two qubits

Daniel Burgarth; Koji Maryuama; Michael Murphy; Simone Montangero; Tommaso Calarco; Franco Nori; Martin B. Plenio

doi:10.1103/PhysRevA.81.040303

Scalable quantum computation via local control of only two qubits

Daniel Burgarth, Koji Maryuama, Michael Murphy, Simone Montangero, Tommaso Calarco, Franco Nori, Martin B. Plenio

Department of Physics

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Abstract

We apply quantum control techniques to a long spin chain by acting only on two qubits at one of its ends, thereby implementing universal quantum computation by a combination of quantum gates on these qubits and indirect swap operations across the chain. It is shown that the control sequences can be computed and implemented efficiently. We discuss the application of these ideas to physical systems such as superconducting qubits in which full control of long chains is challenging.

Original language	English
Article number	040303
Number of pages	4
Journal	Physical Review A
Volume	81
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevA.81.040303
Publication status	Published - 22 Apr 2010

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author = "Daniel Burgarth and Koji Maryuama and Michael Murphy and Simone Montangero and Tommaso Calarco and Franco Nori and Plenio, {Martin B.}",

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AU - Nori, Franco

AU - Plenio, Martin B.

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AB - We apply quantum control techniques to a long spin chain by acting only on two qubits at one of its ends, thereby implementing universal quantum computation by a combination of quantum gates on these qubits and indirect swap operations across the chain. It is shown that the control sequences can be computed and implemented efficiently. We discuss the application of these ideas to physical systems such as superconducting qubits in which full control of long chains is challenging.

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Scalable quantum computation via local control of only two qubits

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