Document Type
Article
Publication Date
1-18-2019
Abstract
The possibility to communicate between spatially separated regions, without even a single photon passing between the two parties, is an amazing quantum phenomenon. The possibility of transmitting one value of a bit in such a way, the interaction-free measurement, has been known for quarter of a century. The protocols of full communication, including transmitting unknown quantum states, were proposed only a few years ago, but it was shown that in all these protocols the particle was leaving a weak trace in the transmission channel, the trace being larger than the trace left by a single particle passing through the channel. This made the claim of counterfactuality of these protocols at best controversial. However, a simple modification of these recent protocols eliminates the trace in the transmission channel, making all these protocols counterfactual.
Recommended Citation
Y. Aharonov and L. Vaidman, Modification of counterfactual communication protocols that eliminates weak particle traces, Phys. Rev. A 99, 010103(R) (2019). https://doi.org/10.1103/PhysRevA.99.010103
Peer Reviewed
1
Copyright
American Physical Society
Comments
This article was originally published in Physical Review A, volume 99r, in 2019. https://doi.org/10.1103/PhysRevA.99.010103