With the realization of super-light navigation, it means that human civilization has once again taken a step forward to the depths of the universe.

However, there is another technical problem that is very forced to solve that is plaguing human civilization.

That is the over-distance communication technology!

In the era of interstellar navigation, without solving the problem of over-distance communication, the spacecraft seemed to have become an isolated small earth and could not communicate with the outside world in real time. This problem was already prominent in the era of expedition to the Alpha galaxy of Centaurus.

The information delay generated by communicating back and forth from the solar system to the Alpha Centaurus is nearly 9 years. Today, the fleet of human civilization has the ability to sail for hundreds of light years. If the communication is still carried out at the speed of light, the delay effect generated during this period will be outrageous!!

Back at the Super Laboratory, Ye Shuchun, the former work assistant of Shichen, had already been waiting for him quietly at the door.

Seeing Yuan Shichen, Ye Shuchun's face turned slightly red and she walked over to report to him with a little shyness: "Leader, several senior commanders of the Expeditionary Force's scientific team are already waiting for you in the conference room."

"Okay, I'll go there now!" Yuan Shichen immediately switched the message conversion glasses to a three-dimensional perspective, and nodded without looking sideways.

This is because in four-dimensional space, looking directly at the lady's body is a hooligan act, because the other person's body will be clearly visible in front of you.

Pushing the door open, there were three people sitting around the circular discussion room. They were Areluya, the science commander of the Expeditionary Force, and two deputy commanders, Luola and Wang Yao.

"Leader!" When the three of them saw Yuan Shichen, they stood up to greet each other.

"Sit down." Yuan Shichen signaled everyone to sit down.

"From today, even if the Expeditionary Fleet officially leaves the Nairi Galaxy," Hara Shin-chan also sat on the chair opposite the three of them and spoke, "From now on, the scientific research work of the Expeditionary Fleet has to rely on ourselves. Although the Expeditionary Fleet has hundreds of thousands of top scientists and professional engineers, our strength is still very weak without the strong foundation of human civilization. So, have you already felt the heavy responsibility on your shoulders?"

"We will do our best!"

"Please rest assured, leader, we know that we have a great responsibility and will fulfill our mission!"

The three of them immediately expressed their opinion.

"Okay, I'm looking forward to everyone's outstanding performance, let's work together." Yuan Shichen continued, "I'm going to let everyone come here today, of course, not to say these scenes, but to discuss several primary scientific research tasks, overdistance communication technology, and new energy development, which are the problems we must solve as soon as possible!"

"If we do not solve the problem of hyper-distance communication technology, as the voyage deepens, it will be difficult for us to maintain smooth connection with the Sun galaxy. And long-term navigation in four-dimensional space will increase the difficulty of energy replenishment. Even if the Expeditionary Force carried a large amount of nuclear fusion energy (mainly used for life and technology consumption), in order to ensure that we must find and develop more new energy in case of emergencies."

"So, what do you think?" Yuan Shichen asked.

"In four-dimensional space, it is a good opportunity to promote super-light speed communication technology." Aleluya, scientific commander of the Expeditionary Force, said first. "In four-dimensional space, like the super-light speed of spacecraft, the transmission speed of different forms of communication signals such as electromagnetic waves and lasers will also break the original limit of 300,000 kilometers per second. In theory, the propagation speed of electromagnetic waves in a three-dimensional vacuum is equal to the speed of light, that is, the upper limit of the speed of three-dimensional space. And so on, in high-dimensional space, will electromagnetic waves also propagate according to the speed limit in this high-dimensional space?"

"If the answer is yes, then it means at least two great news for us." Yuan Shichen said, "First, we can determine the speed limit of the four-dimensional space by measuring the actual propagation speed of electromagnetic waves in the four-dimensional space. Second, even if it is impossible to achieve instantaneous communication over distance, communication at the limit speed of four-dimensional space will greatly improve the efficiency of message transmission."

"It's true!" Everyone agreed.

"It's a pity, the answer is no!" Yuan Shichen poured a scoop of cold water on everyone, "In fact, I have measured that the electromagnetic waves emitted by normal situations still propagate at the speed of light in three-dimensional space and have not improved."

"It turns out to be so!" Everyone was surprised and disappointed.

"However, we still have the opportunity to achieve super-light speed communication." Yuan Shichen speculated, "Since the expeditionary force from three-dimensional space can achieve super-light speed motion by accelerating, we can also accelerate the gain of electromagnetic waves or lasers!"

"You are right, this is indeed a way of thinking." Luola, deputy commander of the Expeditionary Force's science, responded, "Then, I will lead this research mission!"

"Okay!" Yuan Shichen answered quite admirably, and the others naturally agreed.

"It's a pity that quantum entanglement technology that has been studied for centuries is meaningless for ultra-distance communication." Wang Yao, another deputy science commander of the Expeditionary Force, sighed with regret. "Although, in recent centuries, quantum entangled ultra-distance light communication has often been talked about by people. But in fact, based on all experimental results, the quantum entangled state cannot conduct so-called ultra-distance speed communication at all."

What is the transmission of message in the quantum entangled state?

We can make a metaphor like this: there are two playing cards, one is a red heart k and the other is a spade k, put them in two sealed boxes. If we don't open the box, we can't know which card is in one of the boxes. (We use these two cards to describe a pair of quantums in an entangled state.)

Suppose a spacecraft takes one of the boxes randomly and starts a interstellar journey, while the other box is placed on Earth.

Until the spacecraft arrived at the Alpha Centauri system, the astronaut on the spacecraft opened the box as agreed in advance. When he opened the box and saw that the card in the box was red heart k, he instantly "knows that" the card in the sealed box on the earth 4.3 light years away was spade k.

From the time when the astronaut opened the box on the Alpha Centaurus to the time when he "knows" the cards in the box on Earth, if the time required for human nerves to transmit information is put aside, then this "communication" is indeed instantaneous and must be "super-light speed".

But in fact, this experiment shows that this "super-light communication" has no practical significance because it cannot convey effective information at all.

The same thing happens in entangled quantum pairs. It is assumed that the quantum is touched from a to transmit communication and transmitting information to b. The observer at b must change the quantum state "after" at a to observe the quantum state at b, because if he observes in advance, he becomes the person sending the signal.

So how should the observer at b know when "when does the signal be sent at a"? This is an unsolvable question.

"This is how science is. Although no progress has been made in research on quantum entanglement over-distance light speed communication, at least we know more about the truth." said Areluya, scientific commander of the Expeditionary Force.
Chapter completed!