Quantum Communication: Two-Way Messaging Without Physical Link?

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Discussion Overview

The discussion centers on the potential for quantum communication to enable two-way messaging without a physical link, particularly in light of recent advancements in measuring quantum states. Participants explore the implications of quantum mechanics for communication systems, including the possibility of using quantum entanglement and teleportation.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that advancements in quantum state measurement could lead to two-way communication without physical links.
  • Another participant asserts that it is impossible to transfer useful information faster than light or without some form of physical transfer, such as light or particles.
  • A different viewpoint questions whether it is possible to teleport information slower than light to facilitate two-way communication, referencing potential applications in satellite communication.
  • Another participant emphasizes the necessity of a transfer channel to transmit information, whether classical or quantum, indicating that something must always be transferred.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of two-way quantum communication without physical links. There is no consensus on the implications of quantum mechanics for communication systems, and the discussion remains unresolved.

Contextual Notes

Participants reference various sources and studies related to quantum communication, but there are unresolved assumptions regarding the nature of information transfer and the definitions of communication channels.

Stanley514
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You cannot transfer (useful) information quicker than light (or without any transfer of light, particles or similar). You can get the same bits at the same time at two positions far away, but you cannot set those bits at one side to receive them at the other.
 
You cannot transfer (useful) information quicker than light
I did not assume it.Could you teleport it slower than light and have two way communication?In one place I read that quantum communication maybe used for satellites.
If so, than any conventional link of communication will NOT be used?
http://www.quantum.at/research/quan...tanglement/entangled-photons-over-144-km.html
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1263786&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F2944%2F28271%2F01263786
http://www.newscientist.com/article/dn19234-satellite-quantum-communication-circles-closer.html
 
You always need a transfer channel to transmit information from A to B. This can be classical, this can be particles in specific quantum states, or whatever, but you have to transfer something.
 

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