ZHANG Sheng-Li, ZOU Xu-Bo, LI Ke, JIN Chen-Hui, GUO Guang-Can. 2007: Information-Disturbance Tradeoff in Estimating the Unknown Three-Qubit GHZ State, Chinese Physics Letters, 24(6): 1456-1459.
| Citation: |
ZHANG Sheng-Li, ZOU Xu-Bo, LI Ke, JIN Chen-Hui, GUO Guang-Can. 2007: Information-Disturbance Tradeoff in Estimating the Unknown Three-Qubit GHZ State, Chinese Physics Letters, 24(6): 1456-1459.
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Information-Disturbance Tradeoff in Estimating the Unknown Three-Qubit GHZ State
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Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026; Electronic Technology Institute, Information Engineering University, Zhengzhou 450004
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Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
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Electronic Technology Institute, Information Engineering University, Zhengzhou 450004
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Available Online:
30/06/2007
- Fund Project:
the National Basic Research Programme of China, the National Natural Science Foundation of China under Grant Nos 10674128 and 60121503, the Knowledge Innovation Project and the Hundreds of Talents Programme of Chinese Academy of Sciences, and
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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 13 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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References
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