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• W3095697958 abstract "In this paper, we propose an online state tomography method for [Formula: see text]-qubit quantum system based on the continuous weak measurement and compressed sensing (CS). The quantum system is described by stochastic master equation. The continuous weak measurement operators for the [Formula: see text]-qubit quantum system, which are indirectly acted on the quantum system, are derived according to the measurement operator results of two-level quantum system. The online time-varying measurement operators are obtained by means of the dynamic evolution equation of the system. The quantum state is online estimated by solving the optimization problem of minimizing the two-norm with the positive definite constraints of density matrix, and we use the nonnegative least squares algorithm to solve the optimization problem. CS theory is used to reduce the number of the measurements in the process of online state estimation. In the numerical experiments, we study the effects of external control field, measurement rate and the different numbers of qubits on the performance in the proposed method. The minimum required numbers of measurements for 2, 3, 4 and 5 qubits are found. The normalized distance and fidelity of our proposed method can achieve satisfying accuracy with small number of measurements." @default.
• W3095697958 created "2020-11-09" @default.
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• W3095697958 date "2020-10-30" @default.
• W3095697958 modified "2023-09-26" @default.
• W3095697958 title "Online quantum state tomography of N-qubit via continuous weak measurement and compressed sensing" @default.
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• W3095697958 doi "https://doi.org/10.1142/s0219749920400067" @default.
• W3095697958 hasPublicationYear "2020" @default.
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