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Note that in the case of pure states, this corresponds to the case of mutually orthogonal state vectors.
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The particular numerical value for δJ was chosen such that the effect of the fidelity drop becomes observable. Alternatively, a more formal approach could be taken, involving the study of a metric tensor, a local quantity induced by the global distance based on the notion of fidelity (see, for example, where the Bures metric was studied).
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These interaction terms are easily expressed in terms of the electron spin operators S and the Nambu operators T, discussed in detail in. They commute with each other, i.e., [T α, S β] =0, for every α,β { 0,+,- }, and they have a common eigenbasis. In fact, these operators satisfy T α S β =0, and act nontrivially in mutually orthogonal subspaces, with even and odd number of particle occupation numbers, respectively, annihilating the states in the other subspace.
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These interaction terms are easily expressed in terms of the electron spin operators S and the Nambu operators T, discussed in detail in. They commute with each other, i.e., [T α, S β] =0, for every α,β { 0,+,- }, and they have a common eigenbasis. In fact, these operators satisfy T α S β =0, and act nontrivially in mutually orthogonal subspaces, with even and odd number of particle occupation numbers, respectively, annihilating the states in the other subspace.
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