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Fidelity Tradeoff in Estimation of Partial Entanglement State with Local Operation and Classic Communication |
| ZHANG Sheng-Li, WANG-Kun**, GUO Jian-Sheng, SHI Jian-Hong |
| The PLA Information Engineering University, Zhengzhou 450004 |
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| Cite this article: |
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ZHANG Sheng-Li, WANG-Kun, GUO Jian-Sheng et al 2015 Chin. Phys. Lett. 32 070302 |
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Abstract In quantum mechanics, there is no measurement process that could gain some information of an unknown quantum state without causing any disturbance. A tradeoff bound between the amount of information gain �� and the concomitant disturbance ? in the measurement process of a bipartite entangled state is actually ingrained. Such a bound is fundamental and closely connected with the entangled degree b. In this work, the bound for estimation of a partial entangled state with a local strategy is investigated. It is shown that, with local operation with classical communication, a monotonic change in the ?–�� picture will be spotted. This is due to the fact that the partial entanglement gradually becomes two individual qubits and, consequently, the optimal operation boils down to local operations. A quantum circuit which achieves the optimal tradeoff is also obtained.
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Received: 26 February 2015
Published: 30 July 2015
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| PACS: |
03.67.-a
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(Quantum information)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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