Quantum Entanglement

This is what Einstein called 'Spooky Action at a Distance'. It's probably one of the wackiest quantum properties ever discovered.

Quantum entanglement is the fact that pairs of particles will have the same quantum state even if they are separated by a large distance. Quantum state refers to the spin, position or momentum of a particle.

Actually, this effect is the result of trying to measure the state of a particle. The act of measuring causes a change. In the case of entanglement the act of measuring causes the pair to match. Basically, the pair of particles acts as a single system. In other words a measurement made on either particle of the pair collapses the state of both instantaneously. This is one of the main tenants of quantum physics. If you measure a particle's state, it will collapse to a lower state. It's maddening but true. But, in the case of paired particles, this collapse will make them both have the same state.

Quantum entanglement will lead to communication systems that can function instantaneously even with light years of separation. This appears to defy the speed of light restriction, but it's not exactly what it seems. Despite this, experiments have shown that information can be sent over long distances with no time delay. What this means is that the arrow of time gets suspended and, in fact, time doesn't matter. Does that mean that time is a mystery? That depends upon how one considers it. Just think of what this would mean for quantum computing. Fast is not a word that could describe it. It would be super fast. The reality is that this idea doesn't violate the speed of light because there is no movement through space.

So, how the heck do they do this trick? One of the ways is to use a nonlinear crystal to split a laser beam of photons into pairs of photons that have combined energies and momenta equal to the energy and momentum of the original photon beam. In other words, the beams are polarized and phase-matched. This process is called parametric down-conversion or what could be called parametric scattering. This process has produced entangled photons.
Think of it this way. It's like two lovers. One can sense what the other it thinking no matter how separated they are. It's like a mystical connection. Einstein should have called it this!
Experiments with this idea will eventually allow NASA and other space agencies to communicate with distant space probes without the delay experienced using radio systems. China has already begun experiments with this concept.

Could this entanglement be the link between our universe and a parallel universe?

Hopefully, we will know the answer soon.

Thanks for reading.