With the realization of faster-than-light travel, it means that human civilization has once again taken a step towards the far-reaching reaches of the universe. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

However, there is still a very urgent technical problem plaguing human civilization.

That's the over-range communication technology!

In the era of interstellar navigation, without solving the problem of over-distance communication, the spaceship seems to become an isolated small earth, unable to communicate with the outside world in real time. This problem has been highlighted in the original expedition to the Alpha Centauri system.

A single round of communication from the solar system to the Alpha Centauri system results in an information delay of nearly 9 years. Nowadays, the fleets of human civilization have the strength to sail hundreds of light-years away, and if communication is still carried out at the speed of light, the delay effect generated during this period will be simply outrageous!!

.......

Back in the super laboratory, Ye Shuchun, Yuan Haochen's work assistant, was already waiting for him quietly at the door.

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

"Okay, I'll go over here!" Yuan Haochen immediately switched his message conversion glasses to a three-dimensional perspective, and nodded without squinting.

This is so because in the fourth dimension, looking directly at a lady's body is a hooliganism, because the other person's body will be in front of you in full view.

Pushing the door open, there were three people sitting around the circular discussion room. They are the scientific commander of the expeditionary force, Areluya, and the two deputy commanders, Laura and Wang Yao.

"Leader!" When the three of them saw Yuan Haochen, they all got up to greet him.

"Sit down." Yuan Haochen motioned for everyone to sit down.

"From today, the expeditionary fleet will officially leave the Sunrise system." Yuan Haochen also sat on the chair opposite the three of them and said, "From this moment on, the scientific research work of the expeditionary force has to rely on ourselves. Although the expeditionary force has hundreds of thousands of top scientists and professional engineers, our strength is still very weak without the strong foundation of human civilization. So, do you already feel the weight of the responsibility on your shoulders? ”

"We'll do our best!"

"Rest assured, leader, we are well aware of the great responsibility and will not fail in our mission!"

The three of them immediately said.

"Okay, I'm looking forward to everyone's excellent performance, let's work together." Yuan Haochen continued, "I asked everyone to come here today, of course, not to say these scenes. Rather, it is to discuss a few of the most important scientific tasks. Over-the-distance communication technology, as well as the development of new energy, this is the problem we must solve as soon as possible! ”

"If we don't solve the problem of ultra-long-distance communication technology, it will be difficult for us to maintain smooth communication with the Sun-Sun Galaxy as the voyage deepens. Even if the expeditionary force carries a large amount of nuclear fusion energy (mainly used for life and scientific and technological consumption), in order to ensure safety, we should also find and develop more new energy sources in case of emergency. ”

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

"In the four-dimensional space, it is a good opportunity to promote faster-than-light communication technology." The scientific commander of the expeditionary force, Arelua, was the first to speak, "In the four-dimensional space, like the faster-than-light travel 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. Theoretically, the propagation speed of electromagnetic waves in a three-dimensional vacuum is equal to the speed of light, which is the upper limit of the speed of three-dimensional space. By analogy, in a 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 big days of good news for us." "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 ultra-long-distance instantaneous communication is not possible, communication at the extreme speed of the four-dimensional space will greatly improve the efficiency of information transmission. ”

"Indeed!" The crowd agreed.

"Unfortunately, the answer is no!" Yuan Haochen poured a scoop of cold water on everyone, "Actually, I have already measured that the electromagnetic waves emitted under normal conditions are still propagating at the speed of light in three-dimensional space, and they have not improved. ”

"That's what happened!" The crowd was amazed and disappointed.

"However, we still have a chance to achieve faster-than-light communication." Yuan Haochen speculated, "Since the expeditionary force from three-dimensional space can achieve faster-than-light motion through acceleration, then we can also accelerate the gain of electromagnetic waves or lasers!" ”

"You're right, it's really an idea." The deputy commander of science of the expeditionary force, Laura Yinghe, said, "Then, I will lead this research mission!" ”

"Good!" Yuan Haochen replied appreciatively, and the others naturally agreed.

"It's a pity that quantum entanglement technology, which has been studied for centuries, is meaningless for over-distance communication." Wang Yao, another deputy commander of science of the expeditionary force, sighed with regret, "Although, in recent centuries, quantum entanglement ultra-light-speed communication has often been talked about. But in fact, according to all the experimental results, quantum entangled states are simply not capable of so-called faster-than-light communication. ”

What is the transmission of information in quantum entangled states?

We can use this analogy: there are two playing cards, one with a king of hearts and the other with a king of spades, and put them in two sealed boxes. If we don't open a box, we won't know which card is in one of the boxes. (We use these two cards to describe a pair of quanta in an entangled state.) )

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

It wasn't until the spacecraft arrived in the Alpha Centauri system that the astronauts on the spacecraft opened the box as agreed, and the moment he opened the box and saw that the card in the box was the king of hearts, he instantly "knew" that the card in the sealed box on Earth 4.3 light-years away was the king of spades.

From the time the astronaut opens the box in the Alpha Centauri galaxy to the time he "knows" the cards in the box on Earth, if you put aside the time it takes for human nerves to transmit information, then this "communication" is indeed instantaneous and certainly "faster-than-light".

But in fact, this experiment shows that this kind of "faster-than-light communication" has no practical significance, because it simply cannot transmit effective information.

The same thing happens in entangled quantum pairs, assuming that the quantum is triggered at A to send a communication to B to transmit information, and the observer at B must change the quantum state at A "after" before he can observe the quantum state at B, because if he makes the observation in advance, he becomes the one who gives the signal.

So how does an observer at B know "when a signal is being sent at A"? It's an unsolvable question.

"Science is like that, and while research into quantum entanglement ultra-light-speed communication has not progressed, at least we know more of the truth." Said the scientific commander of the expeditionary force, Areluja.

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(To be continued.) )