I. Sainz, Ernesto Camacho, Andrés García, Andrei B. Klimov
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引用次数: 0
摘要
我们观察到,具有奇数局部维度的 n 部分系统的离散维格纳函数(DWF)在断层扫描上是通用的,这反映在任何稳定器的 DWF 的三角函数形式上。然而,在 n-qubit 情况下,由于映射核的非因子化,这一特性并不成立,因为映射核的明确形式取决于离散相空间的特定分区。然而,事实证明,某些特定稳定器的 DWF(不包括在用于构建维格纳映射的集合中)具有三角函数的形式。这意味着,在给定稳定器状态下对四比特系统的保利测量进行经典模拟的可能性与实验装置密切相关。
Tomographic Universality of the Discrete Wigner Function
We observe that the discrete Wigner functions (DWFs) of n-partite systems with odd local dimensions are tomographically universal, as reflected in the delta function form of the DWF for any stabilizer. However, in the n-qubit case, this property does not hold due to the non-factorization of the mapping kernel, the explicit form of which depends on a particular partition of the discrete phase space. Nonetheless, it turns out that the DWF for some specific stabilizers, not included in the set used for the construction of the Wigner map, takes on the form of a delta function. This implies that the possibility of classical simulations of Pauli measurements in a given stabilizer state for qubit systems is closely tied to the experimental setup.