Quantum Α-Fidelity of Unitary Orbits
Quantum information processing(2020)
摘要
The extremum values of quantum α -fidelity under unitary orbits of quantum states are explicitly derived by applying rearrangement inequalities, matrix trace inequalities, and theory of majorization. Furthermore, the α -fidelity is successfully verified to go through the whole closed interval, which works from the minimum value to the maximum value.
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关键词
Quantum -fidelity,Unitary orbit,Matrix trace inequality,Majorization
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