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Introductory Physics Homework Help
How to get the matrices in partial trace
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[QUOTE="munirah, post: 5508523, member: 583688"] [h2]Homework Statement [/h2] Good day, I want to ask the matrix that obtained from below formula and example. $$tr_A(L_{AB})=\sum_i [(\langle i|\otimes id)L_{AB}(|i\rangle\otimes id)]$$ this formula above can be represented as in matrix form below, $$tr_A(L_{AB})= \left(\array{1&0&0&0\\0&1&0&0}\right)\cdot \left(\array{0&0&1&0\\1&0&0&0\\0&0&0&0\\0&0&0&0} \right)\cdot \left( \array{1&0\\0&1\\0&0\\0&0}\right)=\left(\array{0&0\\1&0} \right)$$ My question are: 1.what its mean by d in this formula? How can I get this d? 2.How he get the first 2X4 matrix? I already calculate but I just get first row only. How it compute from the formula exactly? Thank you [/QUOTE]
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Introductory Physics Homework Help
How to get the matrices in partial trace
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