Abstract
We show that operationally (i.e., in an experiment), a quantum state can be defined only up to an equivalence class. The problem of preparing a pure state is considered.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 29–32, December, 1983.
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Vainshtein, V.D. Some comments about preparing a quantum state. Soviet Physics Journal 26, 1088–1091 (1983). https://doi.org/10.1007/BF00894639
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DOI: https://doi.org/10.1007/BF00894639