Foundations of Physics

, Volume 32, Issue 4, pp 531-565

First online:

The Bloch Gyrovector

  • Jing-Ling ChenAffiliated withLaboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics
  • , Abraham A. UngarAffiliated withDepartment of Mathematics, North Dakota State University

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Hyperbolic vectors are called gyrovectors. We show that the Bloch vector of quantum mechanics is a gyrovector. The Bures fidelity between two states of a qubit is generated by two Bloch vectors. Treating these as gyrovectors rather than vectors results in our novel expression for the Bures fidelity, expressed in terms of its two generating Bloch gyrovectors. Taming the Thomas precession of Einstein's special theory of relativity led to the advent of the theory of gyrogroups and gyrovector spaces. Gyrovector spaces, in turn, form the setting for various models of the hyperbolic geometry of Bolyai and Lobachevski just as vector spaces form the setting for the standard model of Euclidean geometry. It is the recent advent of the theory of gyrogroups and gyrovector spaces that allows the Bures fidelity to be studied in its natural context, hyperbolic geometry, resulting in our new representation of the Bures fidelity, that reveals simplicity, elegance, and hyperbolic geometric significance.

Bloch vector Bures fidelity Einstein's addition: gyrovector hyperbolic geometry