D. H. Mahler, Lee A. Rozema, Ardavan Darabi, Chris Ferrie, Robin Blume-Kohout, A. M. Steinberg
We introduce a simple protocol for adaptive quantum state tomography, which reduces the worst-case infidelity between the estimate and the true state from O(N^(-1/2)) to O(N^(-1)). It uses a single adaptation step and just one extra measurement setting. In a linear optical qubit experiment, we demonstrate a full order of magnitude reduction in infidelity (from 0.1% to 0.01%) for a modest number of samples (N=3*10^4).
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http://arxiv.org/abs/1303.0436
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