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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 |
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| Cite this article: |
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ZHANG Sheng-Li, ZOU Xu-Bo, LI Ke et al 2007 Chin. Phys. Lett. 24 1456-1459 |
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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 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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| Keywords:
03.67.-a
03.65.Ud
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Received: 26 December 2006
Published: 17 May 2007
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| PACS: |
03.67.-a
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(Quantum information)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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