Adaptive quantum state tomography improves accuracy quadratically

Publication Type:
Journal Article
Physical Review Letters, 2013, 111 (18)
Issue Date:
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We introduce a simple protocol for adaptive quantum state tomography, which reduces the worst-case infidelity [1-F(ρρ)] between the estimate and the true state from O(1/√N) to O(1/N). 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≈3×104). © 2013 American Physical Society.
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