High School Quantum entanglement and communications

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SUMMARY

Quantum entanglement cannot be utilized for faster-than-light communications, as established by the quantum no-signalling theorem. This theorem asserts that entangled particles cannot transmit information instantaneously across distances, thus prohibiting the possibility of instantaneous communication between Earth and Mars or any other locations in space. The discussion references relevant resources, including a thread on Physics Forums and encourages further exploration of the no-signalling theorem.

PREREQUISITES
  • Understanding of quantum mechanics principles
  • Familiarity with the quantum no-signalling theorem
  • Knowledge of quantum entanglement concepts
  • Basic grasp of communication theory in physics
NEXT STEPS
  • Research the quantum no-signalling theorem in detail
  • Explore the implications of quantum entanglement in communication
  • Investigate current advancements in quantum communication technologies
  • Study the limitations of quantum mechanics in information transfer
USEFUL FOR

Physicists, quantum mechanics researchers, and anyone interested in the theoretical limits of communication technologies in the context of space exploration.

ElliotSmith
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TL;DR
Could quantum entanglement be used to send faster-than-light communications across the cosmos?
Could quantum entanglement be used to send faster-than-light communications across vast distances in space, in the distant future?

For example, if humans establish permanent colonies on Mars, it would take some time to send communications between Earth and Mars.

Could a future technology exploit quantum mechanics to send these communications back-and-forth instantaneously or almost instantaneously?
 
Physics news on Phys.org
Also google for "quantum no-signalling theorem" and check out the "Related Threads" at the bottom of this page.
 

Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?
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