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arXiv 1503.07128quant-phphysics.hist-ph
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上下文不变和局部准隐变量(qHV)建模与上下文和非局部HV建模

Context-invariant and local quasi hidden variable (qHV) modelling versus contextual and nonlocal HV modelling

Elena R. Loubenets

摘要:

对于D维量子系统上的所有联合冯诺依曼测量,我们给出了上下文不变准隐变量(qHV)模型的具体例子,在[Loubenets,J. Math. Phys. 56,032201(2015)]中证明了每个希尔伯特空间都存在。在这个模型中,一个量子可观测量X由满足量子基础所需的函数条件的各种随机变量表示,但与上下文模型相反,这些随机变量中的每一个都等效地在所有联合冯诺依曼测量下对X进行建模,而不管它们的上下文。这,特别是,意味着特定的本地QHV(LqHV)模型的N-量子态,并允许我们推导出新的精确上限的最大违反2x…在N-量子态上的N-部联合冯诺依曼测量下的任何类型的(关于关联函数或关于联合概率的)x2-设置Bell型不等式。对于d=2,这个新的上限与Mermin-Klyshko不等式的N量子比特状态的最大违反相一致。基于我们的研究结果,我们讨论了上下文不变和局部qHV建模的概念和数学优势。

英文摘要:

For all the joint von Neumann measurements on a D-dimensional quantum system, we present the specific example of a context-invariant quasi hidden variable (qHV) model, proved in [Loubenets, J. Math. Phys. 56, 032201 (2015)] to exist for each Hilbert space. In this model, a quantum observable X is represented by a variety of random variables satisfying the functional condition required in quantum foundations but, in contrast to a contextual model, each of these random variables equivalently models X under all joint von Neumann measurements, regardless of their contexts. This, in particular, implies the specific local qHV (LqHV) model for an N-qudit state and allows us to derive the new exact upper bound on the maximal violation of 2x...x2-setting Bell-type inequalities of any type (either on correlation functions or on joint probabilities) under N-partite joint von Neumann measurements on an N-qudit state. For d=2, this new upper bound coincides with the maximal violation by an N-qubit state of the Mermin-Klyshko inequality. Based on our results, we discuss the conceptual and mathematical advantages of context-invariant and local qHV modelling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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