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Nonlocality in instantaneous quantum circuits
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Paper
Nonlocality in instantaneous quantum circuits
2014
Overview
We show that families of Instantaneous Quantum Polynomial (IQP) circuits corresponding to nontrivial Bell tests exhibit nonlocality. However, we also prove that this nonlocality can only be demonstrated using post-selection or nonlinear processing of the measurement outcomes. Therefore if the output of a computation is encoded in the parity of the measurement outcomes, then families of IQP circuits whose full output distributions are hard to sample still only provide a computational advantage relative to locally causal theories under post-selection. Consequently, post-selection is a crucial technique for obtaining a computational advantage for IQP circuits (with respect to decision problems) and for demonstrating nonlocality within IQP circuits, suggesting a strong link between these phenomena.
Publisher
Cornell University Library, arXiv.org
Subject
