Quantum Entanglement

Quantum Entanglement


Annihilation is the condition in which matter and antimatter gets collide together and produce energy. When electron and positron collides it produces two photons which are entangled. Means one photon is in "up" state whereas another will be in "down" state when we measure any one of the photon. But if we don't measure then photons are in both state "up" and "down" simultaneously. If one photon is kept one side of the universe and another in another side of the universe measuring one state of photon can affect another photon at the same time. If we find one photon is in "up" state at the same time another will be in "down" state. This phenomenon is called Quantum Entanglement.

Equation for Quantum Entanglement


I cannot decide which state to collapse the composite system into, and therefore cannot transmit information to Bob by acting on her system. Causality is thus preserved, in this particular scheme. For the general argument, see no-communication theorem in Wikipedia.

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