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Optimal Broadcasting of Mixed Equatorial Qubits |
| YU Zong-Wen |
| Department of Mathematical Sciences, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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YU Zong-Wen 2009 Chin. Phys. Lett. 26 080304 |
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Abstract We derive an optimal 2→M phase-covariant quantum broadcasting of mixed equatorial qubits. This quantum broadcasting is optimal in the sense that the shrinking factor between the input and the output single qubit achieves the upper bound. The result shows that we can copy two identical mixed equatorial qubits with the same quality as those of two identical pure equatorial states.
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| Keywords:
03.67.-a
03.67.Ta
03.67.Mn
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Received: 09 March 2009
Published: 30 July 2009
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