Information-Disturbance Tradeoff in Estimating the Unknown Three-Qubit GHZ State
ZHANG Sheng-Li1,2, ZOU Xu-Bo1, LI Ke1, JIN Chen-Hui2, GUO Guang-Can1
1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 2300262Electronic Technology Institute, Information Engineering University, Zhengzhou 450004
Information-Disturbance Tradeoff in Estimating the Unknown Three-Qubit GHZ State
1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 2300262Electronic Technology Institute, Information Engineering University, Zhengzhou 450004
摘要In a recent paper, Sacchi (Phys. Rev. Lett. 96(2006)220502) studied the information-disturbance tradeoff in estimating an unknown two-qubit maximally entangled state. In this study, we explore the tradeoff in estimating an unknown three-qubit GHZ state. The optimal estimation process supplies a fidelity of 13/54 and the tradeoff interpolates smoothly between non-informative measurement and optimal estimation process.
Abstract：In a recent paper, Sacchi (Phys. Rev. Lett. 96(2006)220502) studied the information-disturbance tradeoff in estimating an unknown two-qubit maximally entangled state. In this study, we explore the tradeoff in estimating an unknown three-qubit GHZ state. The optimal estimation process supplies a fidelity of 13/54 and the tradeoff interpolates smoothly between non-informative measurement and optimal estimation process.
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2007, Vol. 24 
