Choice of Measurement Sets in Qubit Tomography

Details Choice of Measurement Sets in Qubit Tomography Choice of Measurement Sets in Qubit Tomography

2007-06-26

arxiv.org/abs/0706.3756v1

Physics

Quantum Physics

13 Pages, 6 figures

Scientific paper

10.1103/PhysRevA.78.052122

Optimal generalized measurements for state estimation are well understood. However, practical quantum state tomography is typically performed using a fixed set of projective measurements and the question of how to choose these measurements has been largely unexplored in the literature. In this work we develop theoretical asymptotic bounds for the average fidelity of pure qubit tomography using measurement sets whose axes correspond to vertices of Platonic solids. We also present complete simulations of maximum likelihood tomography for mixed qubit states using the Platonic solid measurements. We show that overcomplete measurement sets can be used to improve the accuracy of tomographic reconstructions.

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