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Quantum Network Tomography via Learning Isometries on Stiefel Manifold

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arXiv:2404.06988v2 Announce Type: replace
Abstract: Explicit mathematical reconstructions of quantum networks play a significant role in developing quantum information science. However, tremendous parameter requirements and physical constraint implementations have become computationally non-ignorable encumbrances. In this work, we propose an efficient method for quantum network tomography by learning isometries on the Stiefel manifold. Tasks of reconstructing quantum networks are tackled by solving a series of unconstrained optimization problems with significantly less parameters. The stepwise isometry estimation shows the capability for providing information of the truncated quantum comb while processing the tomography. Remarkably, this method enables the compressive quantum comb tomography by specifying the dimensions of isometries. As a result, our proposed method exhibits high accuracy and efficiency.

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