Measures of operator entanglement of two-qubit gates

Abstract

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.

Regular article

References in corpus (2)

• Entangling Power of Permutations
• Entangling power and local invariants of two-qubit gates

Cited by in corpus (5)

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• Localization and integrability breaking in weakly interacting Floquet circuits
• Operator entanglement of two-qubit joint unitary operations revisited: Schmidt number approach
• Nonlocal characteristics and argand diagram of two-qubit gates