Adaptive quantum state tomography improves accuracy quadratically

Dylan H Mahler, Lee A. Rozema, Ardavan Darabi, Chris Ferrie, Robin Blume-Kohout, A. M. Steinberg

Research output: Contribution to journalArticle (Academic Journal)peer-review

102 Citations (Scopus)
266 Downloads (Pure)


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 × 104).
Original languageEnglish
Article number183601
Number of pages8
JournalPhysical Review Letters
Issue number18
Early online date29 Oct 2013
Publication statusPublished - 1 Nov 2013


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