Entanglement of a pair of quantum bits

Entanglement of a pair of quantum bits
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DOI:
10.1103/physrevlett.78.5022
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发表时间:
1997-06-30
影响因子:
8.6
通讯作者:
Wootters, WK
Wootters, WK
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Hill, S;Wootters, WK

文献摘要

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一个二分量子系统的混合态rho的“形成纠缠”可以定义为创建一个代表rho的纯态系综所需的最小单态数。我们找到了一个精确的公式,纠缠的形成为两个量子比特的所有混合态不超过两个非零本征值,我们报告的证据表明,该公式是有效的,这个系统的所有状态。
The ''entanglement of formation'' of a mixed state rho of a bipartite quantum system can be defined as the minimum;number of singlets needed to create an ensemble of pure states that represents rho. We find an exact formula for the entanglement of formation for all mixed states of two qubits having no more than two nonzero eigenvalues, and we report evidence suggesting that the formula is valid for all states of this system.