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Hatim Salih discovered a method for transferring a quantum state with no particles present in the transmission channel, which he named counterportation. Recently (Salih 2023 Quantum Sci. Technol.8 025016), he presented a feasible procedure for its implementation. The modification of the protocol by Aharonov and Vaidman, adopted by Salih, justifies the claim that no photons were present in the transmission channel during counterportation. We argue, however, that there is an error in this paper. The analysis of a simplified protocol, which questions the validity of the two-state vector formalism description of the photon presence in the communication channel, is incorrect.


This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Quantum Science and Technology, volume 9, issue 1, in 2024 following peer review. This article may not exactly replicate the final published version. The definitive publisher-authenticated version is available online at

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Available for download on Saturday, January 04, 2025