PIRSA:18070056 Conference Quantum Foundations

DOI10.48660/18070056

Conference/School: Foundations of Quantum Mechanics

Vaidman, L. (2018). Counterfactual communication protocols. Perimeter Institute. https://pirsa.org/18070056

Vaidman, Lev. Counterfactual communication protocols. Perimeter Institute, Aug. 03, 2018, https://pirsa.org/18070056 

@misc{ pirsa_PIRSA:18070056,
  doi = {10.48660/18070056},
  url = {https://pirsa.org/18070056},
  author = {Vaidman, Lev},
  keywords = {Quantum Foundations},
  language = {en},
  title = {Counterfactual  communication protocols},
  publisher = {Perimeter Institute},
  year = {2018},
  month = {aug},
  note = {PIRSA:18070056 see, \url{https://pirsa.org}}
}

Abstract

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, was known for quarter of a century. The protocols of full communication, including transmitting unknown quantum states were proposed only 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 larger than the trace left by a single particle passing through the channel. However, a simple modification of these recent protocols eliminates the trace in the transmission channel and makes all these protocols truly counterfactual.

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