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arXiv 2006.00469quant-phcs.ITmath.IT
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纠缠辅助的一次性经典通信中的语境性

Contextuality in entanglement-assisted one-shot classical communication

Shiv Akshar Yadavalli, Ravi Kunjwal

摘要:

我们考虑纠缠辅助的一次性经典通信问题。在零差错状态下,纠缠可以按照Cuffalet等人的策略增加一类经典信道的一次性零差错容量,物理修订版信函104,230503(2010)中所述。该策略使用仅适用于投影测量的Kochen-Specker定理。因此,在噪声状态和/或测量的情况下,该策略不能增加容量。为了适应一般嘈杂的情况下,我们研究发送固定数量的经典消息的一次性成功概率。我们表明,准备上下文权力的量子优势在这项任务中,增加了一次成功的概率超过其经典的最大值。我们的治疗方法超出了Cuvedel等人的范围,包括例如Prevedel等人的实验实施方案,物理修订版信函106,110505(2011)。然后,我们展示了这个通信任务和相应的非本地游戏之间的映射。这种映射概括了与先前在零错误情况下提到的伪心灵感应游戏的联系。最后,在激励一个约束条件,我们术语上下文无关猜测,我们证明了上下文见证的噪声鲁棒noncontextuality不等式在R。Kunjwal,Quantum 4,219(2020)足以提高一次性成功概率。这为这些不等式和相关的超图不变量,加权最大可预测性,提供了一个操作意义。Kunjwal,Quantum 3,184(2019).我们的研究结果表明,纠缠辅助一次性经典通信的任务提供了一个肥沃的土壤,研究的相互作用的Kochen-Specker定理,Spekkens上下文,贝尔非局部性。

英文摘要:

We consider the problem of entanglement-assisted one-shot classical communication. In the zero-error regime, entanglement can increase the one-shot zero-error capacity of a family of classical channels following the strategy of Cubitt et al., Phys. Rev. Lett. 104, 230503 (2010). This strategy uses the Kochen-Specker theorem which is applicable only to projective measurements. As such, in the regime of noisy states and/or measurements, this strategy cannot increase the capacity. To accommodate generically noisy situations, we examine the one-shot success probability of sending a fixed number of classical messages. We show that preparation contextuality powers the quantum advantage in this task, increasing the one-shot success probability beyond its classical maximum. Our treatment extends beyond Cubitt et al. and includes, for example, the experimentally implemented protocol of Prevedel et al., Phys. Rev. Lett. 106, 110505 (2011). We then show a mapping between this communication task and a corresponding nonlocal game. This mapping generalizes the connection with pseudotelepathy games previously noted in the zero-error case. Finally, after motivating a constraint we term context-independent guessing, we show that contextuality witnessed by noise-robust noncontextuality inequalities obtained in R. Kunjwal, Quantum 4, 219 (2020), is sufficient for enhancing the one-shot success probability. This provides an operational meaning to these inequalities and the associated hypergraph invariant, the weighted max-predictability, introduced in R. Kunjwal, Quantum 3, 184 (2019). Our results show that the task of entanglement-assisted one-shot classical communication provides a fertile ground to study the interplay of the Kochen-Specker theorem, Spekkens contextuality, and Bell nonlocality.

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