There are two ways to make quantum systems exchange information.

The first method is to raise the energy level of the particles and make them resonate with the same frequency. Another method is to use two connector particles and use a very low energy level as a medium that transmits information between the systems. 

The problem with quantum communication is simple how to adjust those systems in the same frequency. Above this text is Maurits Escher's painting "Waterfall". And that thing can introduce one of the biggest problems with the quantum system. 

If we want to change information between two towers of that system, we must adjust those towers in the same frequency. And then make the quantum entanglement between those towers. 

Because those towers are part of the same quantum system, there is the possibility to make those crystals resonate and exchange information. But then we can think that the actor that sends information will throw the information from another tower to the next there is the possibility that the information transmitted will miss that receiver tower. 

There would be outcoming energy that destroys the resonation. And that thing makes information go somewhere else it should. 

We always think that information must travel through the system from upward. In that way, system operators would rise the energy level of the quantum participants of the communication. And that thing requires very high accuracy. 

The quantum entanglement and superposition are like a bridge between those towers. In that case, the energy level of those towers will rise to the same level. And then the material or elementary particles will put to resonate with the same frequency. Then the sender side of the superpositioned quantum entanglement will rise to a higher level. 

And that makes the information flow. When the energy level of quantum entanglement rises to the same level, the radiation that the sides of that quantum entanglement will break the entirety by pushing those superpositioned and entangled particles away. That's why the quantum entanglement can stay only a short time. 

The low-energy communication model. 

But there is another way to think about quantum communication. If the system wants to transmit information between those towers it can use four actors in that process. The first actor can drop the information to the second actor. 

That stands at the quantum structure's base floor or base energy level. Then that actor transfer information to the actor that is below the second tower. And the third actor will drop the wire and pull that message or information up to the second or receiving tower. 

Or airflow or energy that is driven behind (or below) that particle. Rises information to the particle at the top of receiving tower. 

There is needed two actors on the ground floor is simple. The system must drive information under the receiving tower. So that's why there needed two actors. And the receiving actor's energy level must be lower. 

This thing is called under-energetic communication. In that version of the communication, the system falls information to the lowest possible energy level. The system drives information to the Bose-Einstein condensate. 

Then that condensate will transfer information to the 2D quasiparticle. And then the laser ray will drive behind that quasiparticle and that makes the information travel from the quasiparticle to the top of the receiving tower to a particle that is waiting for the information. 

The thing that makes this process difficult is the complexity of the system. It's difficult to find the receiving tower in complex systems. Adjusting those systems is very hard. The information transporter must find the right route to the receiving tower. And that is very difficult. The route can be a series of particles that resonate with the same frequency but the energy level turns lower all the time.