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• W4387031347 abstract "Learning dynamics from repeated observation of the time evolution of an open quantum system, namely, the problem of quantum process tomography is an important task. This task is difficult in general, but, with some additional constraints could be tractable. This motivates us to look at the problem of Lindblad operator discovery from observations. We point out that for moderate size Hilbert spaces, low Kraus rank of the channel, and short time steps, the eigenvalues of the Choi matrix corresponding to the channel have a special structure. We use the least-square method for the estimation of a channel where, for fixed inputs, we estimate the outputs by classical shadows. The resultant noisy estimate of the channel can then be denoised by diagonalizing the nominal Choi matrix, truncating some eigenvalues, and altering it to a genuine Choi matrix. This processed Choi matrix is then compared to the original one. We see that as the number of samples increases, our reconstruction becomes more accurate. We also use tools from random matrix theory to understand the effect of estimation noise in the eigenspectrum of the estimated Choi matrix." @default.
• W4387031347 created "2023-09-26" @default.
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• W4387031347 date "2023-09-22" @default.
• W4387031347 modified "2023-09-27" @default.
• W4387031347 title "Learning the eigenstructure of quantum dynamics using classical shadows" @default.
• W4387031347 doi "https://doi.org/10.48550/arxiv.2309.12631" @default.
• W4387031347 hasPublicationYear "2023" @default.
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