Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/49380
Title: Symmetric Minimal Quantum Tomography and Optimal Error Regions
Authors: SHANG JIANGWEI
Keywords: quantum state tomography, successive measurements, SIC POM, MUB, optimal error regions, bounded-likelihood region
Issue Date: 7-Oct-2013
Source: SHANG JIANGWEI (2013-10-07). Symmetric Minimal Quantum Tomography and Optimal Error Regions. ScholarBank@NUS Repository.
Abstract: This thesis comprises the study of two basic topics in quantum information science: symmetric minimal quantum tomography and optimal error regions. Part I of this thesis discusses the implementation of the symmetric informationally complete probability-operator measurement (SIC POM) in the finite-dimensional Hilbert space in terms of two successive measurements. We show that any Heisenberg-Weyl group-covariant SIC POM can be realized by such a sequence where the second measurement is simply a measurement in the Fourier basis. Furthermore, we study in particular such constructions of SIC POMs in dimensions 2, 3, 4, and 8. Surprisingly, this formulation reveals an operational relation between mutually unbiased bases (MUB) and SIC POMs. As a laboratory application, feasible optical experiments are proposed that would realize SIC POMs in various dimensions. Part II of this thesis presents a simple construction of optimal error regions for quantum state estimation. Any point estimator has to be supplemented with an error region that summarizes our uncertainty about the guess, here we show that the optimal choices for two types of error regions---the maximum-likelihood region, and the smallest credible region---are both concisely described as the set of all states for which the likelihood exceeds a threshold value, that is, a bounded-likelihood region. This surprisingly simple characterization permits concise reporting of the error regions even in high-dimensional problems.
URI: http://scholarbank.nus.edu.sg/handle/10635/49380
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