Quantum Entanglement by Heartsound Audio

 


Quantum entanglement is the occurrence of a group of particles that are created, interacting, or share spatial proximity in such a way that the quantum state of each particle cannot be described independently of the state of others, even when separated by a large distance.

It is at the center of the disagreement between classical and quantum physics: Entanglement is the number one  feature of quantum mechanics not present in classical mechanics. 

Particle position, momentum, spin and polarization are measurements of the physical properties of entangled particles, and sometimes they are found to be perfectly compatible.  

Their behavior can be somewhat paradoxical, any measurement of a particles properties results in an apparent and irreversible wave function collapse Of that particle and changes to the original quantum state. With entangled particles, such measurements affect the entangled system as a whole.

Einstein and others considered such behavior impossible, as it violated the local realism view of casualty. Einstein even called it a “ Spooky action at a distance.” He argued that the accepted formulation of quantum mechanics must therefore be incomplete.

Later, tests were performed where polarization, or spin of entangled particles were measured at separate locations. In earlier tests, it could not be ruled out that the result at one point could not be transmitted to the secondary point without affecting the outcome. 

According to some interpretations, the effect of one measurement occurs instantly. Others do not accept the wave function collapse, and dispute any effect at all. However, all interpretations agree that entanglement produces a relationship between the measurement, and the information between entangled particles can be exploited, but any transmission of information at faster than light speeds is yet impossible. 

Quantum entanglement has been shown experimentally, using photons, electrons, top quarks, molecules and other nanoparticles. 

Future uses include communications, computations, and quantum radar. 

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