Quantum Mechanics and Quantum Entanglement

Quantum Entanglement: A 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 separated in space. This results in a correlation between the observable physical properties of the systems such that a change in one object causes an instantaneous change in the other.

Special Relativity is generally thought to prevent classical information from being sent faster than light by this means. One reason is that the two particles need to be near each other to become entangled, or they need an intermediate particle, which has to be near one particle and then the other. However this would not prevent sending information faster than light in cases where the sender and receiver were originally near each other and then separated such as s apace ship that leaves Earth and uses such a means for communications.

Quantum entanglement is a quantum effect that has no parallel in Classical mechanics.