排序方式: 共有19条查询结果,搜索用时 15 毫秒
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With the development of quantum information processing, multipartite entanglement measures are needed in many cases. However, there are still no complete orthogonal genuine multipartite entanglement(GME) bases available as Bell states to bipartite systems. To achieve this goal, we find a method to construct complete orthogonal GME states, and we exclude many equivalent states by leveraging the group theory. We also provide the case of a 3-order 3-dimensional Hilbert space as an example and study the application of general results in the dense coding scheme as an application. Moreover, we discuss some open questions and believe that this work will enlighten extensive studies in this field. 相似文献
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基于密度泛函理论第一性原理的方法,使用CALYPSO结构搜索技术结合VASP软件,在0~100 GPa压强范围内对MgN8的晶体结构进行预测,并对预测的结构进行系统研究。结果表明:在常压下,空间群为P4/mbm的α-MgN8晶体结构的焓值最低;当压强达到24.3 GPa和68.3 GPa时发生相变,分别相变成空间群为P4/mnc的β-MgN8相和空间群为Cmcm的γ-MgN8相,两次相变均为对应体积坍塌的一级相变。电子性质计算结果表明,α-MgN8相的导带与价带之间具有3.09 eV的带隙,表明该结构具有非金属性;β相和γ相具有明显的金属特征。Bader电荷转移计算表明,随着压力的增加,Mg原子向N原子转移的电荷逐渐增多。 相似文献
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Zhan-Yun Wang 《中国物理 B》2022,31(7):70302-070302
We investigate how the correlated actions of quantum channels affect the robustness of entangled states. We consider the Bell-like state and random two-qubit pure states in the correlated depolarizing, bit flip, bit-phase flip, and phase flip channels. It is found that the robustness of two-qubit pure states can be noticeably enhanced due to the correlations between consecutive actions of these noisy channels, and the Bell-like state is always the most robust one. We also consider the robustness of three-qubit pure states in correlated noisy channels. For the correlated bit flip and phase flip channels, the result shows that although the most robust and most fragile states are locally unitary equivalent, they exhibit different robustness in different correlated channels, and the effect of channel correlations on them is also significantly different. However, for the correlated depolarizing and bit-phase flip channels, the robustness of two special three-qubit pure states is exactly the same. Moreover, compared with the random three-qubit pure states, they are neither the most robust states nor the most fragile states. 相似文献
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