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Optimal large-scale quantum state tomography with Pauli measurements. (English) Zbl 1341.62116

Summary: Quantum state tomography aims to determine the state of a quantum system as represented by a density matrix. It is a fundamental task in modern scientific studies involving quantum systems. In this paper, we study estimation of high-dimensional density matrices based on Pauli measurements. In particular, under appropriate notion of sparsity, we establish the minimax optimal rates of convergence for estimation of the density matrix under both the spectral and Frobenius norm losses; and show how these rates can be achieved by a common thresholding approach. Numerical performance of the proposed estimator is also investigated.

MSC:

62H12 Estimation in multivariate analysis
81P50 Quantum state estimation, approximate cloning
62C20 Minimax procedures in statistical decision theory
62P35 Applications of statistics to physics
81P45 Quantum information, communication, networks (quantum-theoretic aspects)
81P68 Quantum computation
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