Some authors have argued that using the no-communication theorem to deduce the impossibility of superluminal communication is circular, since the no-communication theorem assumes that the system is composite. A special case of this is the no-communication theorem, which prevents communication using the quantum entanglement of a composite system shared between two spacelike-separated observers. Technically, the microscopic causality postulate of axiomatic quantum field theory implies the impossibility of superluminal communication using any phenomena whose behavior can be described by orthodox quantum field theory. However, it is now well understood that quantum entanglement does not allow any influence or information to propagate superluminally. The impossibility of superluminal communication led Einstein, Podolsky, and Rosen to propose that quantum mechanics must be incomplete (see EPR paradox). Entangled states lead to correlations in the results of otherwise random measurements, even when the measurements are made nearly simultaneously and at far distant points. Quantum mechanics is non-local in the sense that distant systems can be entangled. However, such fields have luminal signal velocity and do not allow superluminal communication. By contrast, tachyonic fields – quantum fields with imaginary mass – certainly do exist and exhibit superluminal group velocity under some circumstances. Because such a particle would violate the known laws of physics, many scientists reject the idea that they exist. Tachyonic particles are hypothetical particles that travel faster than light, which could conceivably allow for superluminal communication. Ī number of theories and phenomena related to superluminal communication have been proposed or studied, including tachyons, neutrinos, quantum nonlocality, wormholes, and quantum tunneling. This complicates causality, but no theoretical arguments conclusively preclude this possibility. ![]() ![]() Superluminal communication other than possibly through wormholes is likely impossible because, in a Lorentz-invariant theory, it could be used to transmit information into the past. The current scientific consensus is that faster-than-light communication is not possible, and to date it has not been achieved in any experiment. Superluminal communication is a hypothetical process in which information is conveyed at faster-than-light speeds.
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