Qubit representation of qudit states: correlations and state reconstruction J. A. López-Saldívar, O. Castaños, M. A. Man'ko, V. I. Man’ko
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ArticleSubject(s): квантовые состояния | квантовые корреляции | геометрическое представление квантовых состояний | восстановление квантовых состояний | Блоха сфера | кубитыGenre/Form: статьи в журналах Online resources: Click here to access online
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Quantum information processing Vol. 18, № 7. P. 210 (1-14)Abstract: A method to establish a qubit decomposition of a general qudit state is presented. This new representation allows a geometrical depiction of any qudit state in the Bloch sphere. Additionally, we show that the nonnegativity conditions of the qudit state imply the existence of quantum correlations between the qubits which compose it. These correlations are used to define new inequalities which the density matrices components must satisfy. The importance of such inequalities in the reconstruction of a qudit state is addressed. As an example of the general procedure, the qubit decomposition of a qutrit system is shown, which allows a classification of the qutrit states by fixing their invariants Tr(ρ^2) , Tr(ρ^3) .
Библиогр.: 29 назв.
A method to establish a qubit decomposition of a general qudit state is presented. This new representation allows a geometrical depiction of any qudit state in the Bloch sphere. Additionally, we show that the nonnegativity conditions of the qudit state imply the existence of quantum correlations between the qubits which compose it. These correlations are used to define new inequalities which the density matrices components must satisfy. The importance of such inequalities in the reconstruction of a qudit state is addressed. As an example of the general procedure, the qubit decomposition of a qutrit system is shown, which allows a classification of the qutrit states by fixing their invariants Tr(ρ^2) , Tr(ρ^3) .
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