Comment on "Multitime quantum communication: Interesting but not counterfactual"

• URL: http://arxiv.org/abs/2306.16756v1
• Date: Thu, 29 Jun 2023 07:53:57 GMT
• Title: Comment on "Multitime quantum communication: Interesting but not counterfactual"
• Authors: Lev Vaidman
• Abstract summary: I argue that the original interaction-free measurement protocol which triggered the definition of the concept of counterfactuality is not counterfactual according to this measure.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In a recent paper, Robert Griffiths [Phys. Rev. A 107, 062219 (2023)] analyzed a protocol for transmission of information between two parties introduced by Salih et al. [Phys. Rev. Lett. 110, 170502 (2013)]. There is a considerable controversy about the counterfactuality of this protocol, and Griffiths suggested to resolve it by introducing a new measure of channel usage, which he called "Cost". I argue that this measure is not appropriate because the original interaction-free measurement protocol which triggered the definition of the concept of counterfactuality is not counterfactual according to this measure.

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