Quantum Information Processing

, Volume 11, Issue 3, pp 787–839 | Cite as

Tools in the Riemannian geometry of quantum computation

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Abstract

An introduction is first given of recent developments in the Riemannian geometry of quantum computation in which the quantum evolution is represented in the tangent space manifold of the special unitary unimodular group for n qubits. The Riemannian right-invariant metric, connection, curvature, geodesic equation for minimal complexity quantum circuits, Jacobi equation, and the lifted Jacobi equation for varying penalty parameter are reviewed. Sharpened tools for calculating the geodesic derivative are presented. The geodesic derivative may facilitate the numerical investigation of conjugate points and the global characteristics of geodesic paths in the group manifold, the determination of optimal quantum circuits for carrying out a quantum computation, and the determination of the complexity of particular quantum algorithms.

Keywords

Quantum computing Quantum circuits Quantum complexity Differential geometry Riemannian geometry Geodesics Lax equation Jacobi fields 

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© Springer Science+Business Media, LLC (outside the USA)  2011

Authors and Affiliations

  1. 1.US Army Research LaboratoryAdelphiUSA

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