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arXiv:1901.08509 · Quantum Information and Measurement (QIM)

Modal, Truly Counterfactual Communication with On-Chip Demonstration Proposal

Jonte R. Hance, Will McCutcheon, Patrick Yard, John Rarity

Published Jan 1, 2019• 7 citations
arXivHTMLPDF

Abstract

We formalize Salih et al’s Counterfactual Communication Protocol (arXiv2018), which allows it not only to be used in with other modes than polarization, but also for interesting extensions (e.g. sending superpositions from Bob to Alice).
DOI
10.1364/qim.2019.t5a.50

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Comment on “Protocol for Direct Counterfactual Quantum Communication”

Lev Vaidman A

I argue that recent "Protocol for Direct Counterfactual Quantum Communication" by Salih et al. [PRL 110, 170502 (2013), arXiv:1206.2042] is counterfactual only for one type of the information bit.

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Reply to "Comment on Protocol for Direct Counterfactual Quantum Communication"

Hatim Salih, Li, Zheng-Hong, M. Al-Amri +1 more

In reply to Vaidman's Comment [arXiv:1304.6689], we show that his claim that our Protocol for Direct Counterfactual Quantum Communication [PRL 110, 170502 (2013), arXiv:1206.2042] is counterfactual only for one type of information bit is wrong.

arXiv:1404.5392•Apr 22, 2014•4 citations
We revisit the "counterfactual quantum communication" of Salih et al. [1], who claim that an observer "Bob" can send one bit of information to a second observer "Alice" without any physical particle traveling between them. We show that a locally conserved, massless current-specifically, a current of modular angular momentum, L_{z} mod 2ℏ-carries the one bit of information. We integrate the flux of L_{z} mod 2ℏ from Bob to Alice and show that it equals one of the two eigenvalues of L_{z} mod 2ℏ, either 0 or ℏ, thus precisely accounting for the one bit of information he sends her. We previously [2] obtained this result using weak values of L_{z} mod ℏ; here we do not use weak values.
The classical theories of communication rely on the assumption that there has to be a flow of particles from Bob to Alice in order for him to send a message to her. We develop a quantum protocol that allows Alice to perceive Bob's message ``counterfactually''; that is, without Alice receiving any particles that have interacted with Bob. By utilizing a setup built on results from interaction-free measurements, we outline a communication protocol whereby the information travels in the opposite direction of the emitted particles. In comparison to previous attempts on such protocols, this one is such that a weak measurement at the message source would not leave a weak trace that could be detected by Alice's receiver. While some interaction-free schemes require a large number of carefully aligned beam splitters, our protocol is realizable with two or more beam splitters. We demonstrate this protocol by numerically solving the time-dependent Schr\"odinger equation for a Hamiltonian that implements this quantum counterfactual phenomenon.