Improvement of Estimation Precision by Adaptive Design of Experiments

Part of the Springer Theses book series (Springer Theses)


As we have seen in Chap.  5, in quantum state tomography, an independently and identically prepared set of measurements are used throughout the entire experiment. However, during the experiment we can imagine changing the measurement at each trial according to the previously obtained data. This experimental design is referred to as adaptive. Clearly, adaptive experimental designs are a superset of the nonadaptive ones, and therefore can potentially achieve higher performance. In this chapter, we propose an adaptive experimental design whose expected losses are smaller than those of standard quantum state tomography. The update criterion is based on average-variance optimality (A-optimality) in classical statistics, and it has low computational cost for one-qubit state estimation. This chapter is structured as follows. In Sect. 6.1 we lay out the notation and terminology in adaptive experimental design. We also explain the A-optimality criterion in this section. In Sect. 6.2 we analyze the performance of the A-optimality criterion in one-qubit state estimation. We give the explicit form of the analytic solution of the A-optimal update criterion. This analytic solution makes it possible to reduce the computational cost of updating measurements. We compare several adaptive and non-adaptive estimation schemes numerically. The numerical results indicate that the A-optimality criterion gives more precise estimates than standard quantum state tomography. We also discuss the feasibility of implementing the proposed scheme experimentally. In Sect. 6.3 we review the history of adaptive design of experiments in quantum estimation. A summary appears in Sect. 6.4.


Adaptive design of experiments A-optimality criterion maximum-likelihood estimator 

Supplementary material


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Copyright information

© Springer Japan 2014

Authors and Affiliations

  1. 1.Department of Physics Graduate School of ScienceThe University of TokyoTokyoJapan

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