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Schmidt decomposition : ウィキペディア英語版
Schmidt decomposition
In linear algebra, the Schmidt decomposition (named after its originator Erhard Schmidt) refers to a particular way of expressing a vector in the tensor product of two inner product spaces. It has numerous applications in quantum information theory, for example in entanglement characterization and in state purification, and plasticity.
==Theorem==
Let H_1 and H_2 be Hilbert spaces of dimensions ''n'' and ''m'' respectively. Assume n \geq m. For any vector w in the tensor product H_1 \otimes H_2, there exist orthonormal sets \ \subset H_1 and \ \subset H_2 such that w= \sum_ ^m \alpha _i u_i \otimes v_i, where the scalars \alpha_i are real, non-negative, and, as a set, uniquely determined by w.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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