Higher-order singular value decomposition and the reduced density matrices of three qubits

被引：0
|
作者：
Pak Shen Choong
Hishamuddin Zainuddin
Kar Tim Chan
Sh. K. Said Husain
机构：
[1] Universiti Putra Malaysia,Institute for Mathematical Research
[2] Universiti Putra Malaysia,Malaysia
来源：
Quantum Information Processing | 2020年 / 19卷
关键词：
Quantum entanglement; Higher-order singular value decomposition; Local unitary equivalence; Three qubits; 15A69;
D O I：
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学科分类号：
摘要：
In this paper, we demonstrate that higher-order singular value decomposition (HOSVD) can be used to identify special states in three qubits by local unitary (LU) operations. Since the matrix unfoldings of three qubits are related to their reduced density matrices, HOSVD simultaneously diagonalizes the one-body reduced density matrices of three qubits. From the all-orthogonality conditions of HOSVD, we computed the special states of three qubits. Furthermore, we showed that it is possible to construct a polytope that encapsulates all the special states of three qubits by LU operations with HOSVD.
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