Abstract
We study positive operator-valued measures generated by projections on one-dimensional subspaces. A special attention is paid to the case in which subspaces are spanned by vectors forming a Riesz basis. It is shown that the measurement fulfilled by such measure is informationally complete for quantum states being a convex hull of projections on subspaces spanned by the system of biorthogonal vectors. We also discuss the properties of different quantum channels associated with a discrete measurement. Finally, we show that our measurement allows to introduce a quantum instrument taking values in the set of two points.
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Acknowledgements
The work of G.G. Amosov was performed at the Steklov International Mathematical Center and supported by the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-15-2022-265).
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Communicated by Airat Bikchentaev.
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Amosov, G.G., Baranov, A.D. & Kronberg, D.A. On positive operator-valued measures generated by a family of one-dimensional projectors. Ann. Funct. Anal. 15, 48 (2024). https://doi.org/10.1007/s43034-024-00351-y
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DOI: https://doi.org/10.1007/s43034-024-00351-y