Measures of operator entanglement of two-qubit gates

Details Measures of operator entanglement of two-qubit gates Measures of operator entanglement of two-qubit gates

2011-06-21

arxiv.org/abs/1106.4139v1

Phys. Rev. A 83, 062320 (2011)

Physics

Quantum Physics

Regular article

Scientific paper

Two different measures of operator entanglement of two-qubit gates, namely, Schmidt strength and linear entropy, are studied. While these measures are shown to have one-to-one relation between them for Schmidt number 2 class of gates, no such relation exists for Schmidt number 4 class, implying that the measures are inequivalent in general. Further, we establish a simple relation between linear entropy and local invariants of two-qubit gates. The implication of the relation is discussed.

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