Quantum entanglement is a quantum mechanical phenomenon in which the quantum states of two or more objects have to be described with reference to each other, even though the individual objects may be spatially separated. This leads to correlations between observable physical properties of the systems.

For example, it is possible to prepare two particles in a single quantum state such that when one is observed to be spin-up, the other one will always be observed to be spin-down and vice versa, this despite the fact that it is impossible to predict, according to quantum mechanics, which set of measurements will be observed.

As a result, measurements performed on one system seem to be instantaneously influencing other systems entangled with it.

But quantum entanglement does not enable the transmission of classical information faster than the speed of light.

Quantum entanglement has applications in the emerging technologies of quantum computing and quantum cryptography, and has been used to realize quantum teleportation experimentally.

At the same time, it prompts some of the more philosophically oriented discussions concerning quantum theory.

The correlations predicted by quantum mechanics, and observed in experiment, reject the principle of local realism, which is that information about the state of a system should only be mediated by interactions in its immediate surroundings.

Different views of what is actually occurring in the process of quantum entanglement can be related to different interpretations of quantum mechanics.

https://www.sciencedaily.com/terms/quantum_entanglement.htm

As a result, measurements performed on one system seem to be instantaneously influencing other systems entangled with it.

But quantum entanglement does not enable the transmission of classical information faster than the speed of light.

Quantum entanglement has applications in the emerging technologies of quantum computing and quantum cryptography, and has been used to realize quantum teleportation experimentally.

At the same time, it prompts some of the more philosophically oriented discussions concerning quantum theory.

The correlations predicted by quantum mechanics, and observed in experiment, reject the principle of local realism, which is that information about the state of a system should only be mediated by interactions in its immediate surroundings.

Different views of what is actually occurring in the process of quantum entanglement can be related to different interpretations of quantum mechanics.

https://www.sciencedaily.com/terms/quantum_entanglement.htm

For much more on the Quantum Entanlglement phenomenon, its origins, experiments and latest developments, please click on the following link:

Quantum Entanglement - a Report by John Brindley

Summary (from the above Report):

Quantum Entanglement - a Report by John Brindley

Summary (from the above Report):

From
the first tests of two-particle entanglement to the very latest, results have
shown violations of Bell’s inequality in all its forms and in every variation
of experimental set-up. The contextuality problem has been addressed and tested
with single neutrons, also showing results that violate Bell’s inequalities. As
no test has been able to prove the existence of any local hidden variables, the
results now show the quantum-mechanical interpretation of natural reality is
accurate in its predictions and conclusive in results.

Research
and development into technological systems and devices using entanglement
effects is already well established; the current and continuing success of
which must surely end the controversy between local-realist and
quantum-mechanical theories.

But
while the quantum-mechanical interpretation of reality is strongly established,
quantum mechanics still lacks a description of the mechanism by which separated
systems remain entangled over potentially any distance. Such a description
would necessarily define and perhaps resolve one of the deepest mysteries at
the heart of our understanding of physical reality.

The following video contains such a description, showing how the theory of Unified Absolute Relativity solves this, deepest of quantum-mechanical mysteries:

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