Adaptive quantum state tomography improves accuracy quadratically

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

doi:10.1103/PhysRevLett.111.183601

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 journal › Article (Academic Journal) › peer-review

127 Citations (Scopus)

320 Downloads (Pure)

Abstract

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 language	English
Article number	183601
Number of pages	8
Journal	Physical Review Letters
Volume	111
Issue number	18
Early online date	29 Oct 2013
DOIs	https://doi.org/10.1103/PhysRevLett.111.183601
Publication status	Published - 1 Nov 2013

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quant-ph

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10.1103/PhysRevLett.111.183601

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AU - Steinberg, A. M.

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Adaptive quantum state tomography improves accuracy quadratically

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