"The gravitational pull around is normal, and it can be determined that it is definitely not a black hole, it must be the entrance and exit of the space-time current."

If it is a black hole, with the huge mass of the black hole, the surrounding gravity will be abnormal, and it can be easily found through the gravitational mirror lens, but now there is no abnormality, which means that it is not gravity.

"Launch a small spaceship into it."

The hatch of the huge oval saucer-shaped spaceship slowly opened, and a small unmanned spaceship slowly flew out, according to the plasma power, it dragged a long blazing white dazzling tail flame towards the entrance and exit of the space-time current, like a firefly in the dark void, very clear.

As soon as the unmanned spaceship entered the range of the entrance and exit of the space-time current, it disappeared almost instantly, as if it had been swallowed up by the darkness around it.

"No contact, no radio contact."

"Well, it seems to be entering the space-time current, the speed of flight in the space-time current exceeds the speed of light, and it should be able to shield electromagnetic waves, only after it leaves the space-time current, it can contact us again when it reaches the Centauri Galaxy, but the Centauri Galaxy is 4.3 light-years away from us, and it will take several years at the speed of electromagnetic waves."

Chen Bin nodded, now he was sure that this was the entrance and exit of the space-time current, through which he could reach another galaxy in a very short time.

"Haha, brothers, I've already discovered the space-time current here."

In the virtual chat world, Chen Bin happily shared the good news, but for a while and a half, others would not receive it at all, the solar system is insignificant compared to the vast universe, but it is still very vast, even if the speed of electromagnetic waves from here to the earth takes several hours, this time and again multiplies by 2.

It can be said that in the vast cosmic void, not only the transportation technology restricts human beings from moving towards the cosmic void, but the same is true of this communication technology, even if the speed of electromagnetic waves reaches the speed of light, but in the cosmic void of light, it still seems too slow.

A few hours later, dozens of astronomical units away from the earth, Li Fu finally received Chen Bin's message.

"Yu Liang, Tang Boyuan, Dong Zhifei, Luo Xiaoyao, Zhanfei, Chen Bin has discovered the space-time current here, have you gained anything over there?"

Li Fu began to contact people from several other directions, and the closest star system to the solar system basically sent a spaceship to explore in each direction.

"We have also discovered the space-time currents in the direction of the Canis Minor, 11 light-years from the solar system."

At this time, Yu Liang's reply.

"The space-time current in the direction of Aquila has also been discovered, and it is currently being accurately located."

Tang Boyuan is also a harvest here, the Aquila Galaxy is 16 light-years away from the solar system.

"The space-time current has not been found in the direction of the Arcthyan galaxy for the time being, and it is still being explored."

Luo Xiaoyao did not harvest here, and the distance between the Southern Fish Galaxy and the solar system is 22 light-years.

"The Arctic Fish Galaxy, which is 22 light-years away, has not found space-time currents, and if anything, there will be no space-time currents at a distance of more than 20 light-years?"

Li Fu summarized everyone's data and carefully analyzed the data.

"Luo Xiaoyao, Zhanfei, Dong Zhifei, you guys will look for a few more days, if you don't find it, it means that there may be no space-time currents beyond the distance, and you can return to the earth."

It's just a few pieces of information, and it's been several days, because the distance is too far apart, dozens of astronomical units, and it takes more than ten hours for electromagnetic signals to go back and forth, which is really difficult for people who are now used to real-time communication.

"It seems that it is necessary to get the quantum communication technology out, in the solar system, the communication has been delayed to this point, if you go to other galaxies in the future, if you go to other galaxies to contact this side of the solar system, if you still rely on the current communication technology, not to mention whether you can get in touch or not, the time alone will be calculated in years."

"Even the nearest Centauri galaxy is 4.3 light-years away from the solar system, and it takes 8.6 years for this electromagnetic wave to come and go, and in such a long time, daylilies have bloomed and fallen many times."

Li Fu's mind began to think, communication technology, transportation technology, these two things are the real constraints on the pace of human beings, just like in ancient times, it is impossible to say that relying on horseback riding and carrier pigeon communication to rule the entire earth, when the vast territory of the Mongol Empire collapsed, in fact, it is not because the territory is too vast, the central government is simply powerless for the remote areas, under the conditions to reach a certain level, such a vast territory will only be a flash in the pan.

Only in modern times, with the rapid development of transportation technology and general technology, let alone the territory as large as the Mongol Empire, even if the entire earth is under the rule of one country, there is no problem at all, because the powerful transportation technology and advanced communication technology are enough for the ruler to mobilize forces from all over the world to support any corner in a very short time.

However, in the interstellar age, the universe is more vast, even at the speed of light, it seems very slow, just in the solar system, the communication of electromagnetic waves can no longer keep up with the requirements of the times.

The quantum communication technology mentioned by Li Fu is the next generation of advanced communication technology proposed by scientists, and the principle of quantum communication technology is a technology based on the principle of quantum entanglement effect.

Quantum communication is mainly based on the theory of quantum entanglement states, and uses quantum teleportation (transmission) to achieve information transfer. According to experimental verification, no matter how far apart two particles with entangled states are, as long as one changes, the other will also change instantaneously.

The process of using this characteristic to realize quantum communication is as follows: construct a pair of particles with entangled states in advance, place the two particles on both sides of the communication respectively, and jointly measure the particles with unknown quantum states and the particles of the sender (an operation), then the particles of the receiver collapse (change) instantaneously, and the collapse (change) becomes a certain state, which is symmetrical with the state of the particles of the sender after collapse (change), and then the information of the joint measurement is transmitted to the receiver through the classical channel. According to the received information, the receiver performs a unitary transformation (equivalent to a reverse transformation) on the collapsed particle, and an unknown quantum state is exactly the same as that of the sender.

It's simple and easy to understand, that's it, quantum is like a pair of twin brothers, and this twin brother is a copy of each other, if one raises his right hand, the other will raise his right hand, one laughs, the other laughs, that is, no matter which one of them makes any action, the other will also make the same action.

And no matter how far apart these two brothers are, the actions of the two brothers are always the same with each other in any state, and there is no time difference between them, and there will be no difference because of the distance, which is the entangled state of quantum.

Because of this characteristic of quantum entanglement, the power of quantum communication technology came into being, theoretically speaking, quantum communication technology can ignore distance, no matter how far away, quantum communication technology can achieve real-time communication without any delay.

Regardless of the distance, this is definitely the technology that must be mastered for astronautics and interstellar colonization, no matter how far away it is, it can keep in touch anytime and anywhere, and it will not be said that there will be communication delays because the distance is too far.

In addition to the specificity of connecting at any time regardless of distance, there are several other features of quantum communication technology that scientists are also full of, one of which is security.

Compared with traditional communication technology and quantum communication, its security and efficiency cannot be compared. In terms of security, quantum communication will never be "leaked", one of which is that the key of quantum encryption is random, and even if it is intercepted by a thief, it is impossible to get the correct key, so the information cannot be cracked.

Second, if the quantum state of two particles in the hands of the two communicating parties changes, the quantum state of the other side will change immediately, and according to the quantum theory, any macroscopic observation and interference will immediately change the quantum state, causing it to collapse, so the information obtained by the stealer due to interference has been destroyed, not the original information.

In addition, quantum communication is very efficient, and the transmitted unknown quantum states will be in an entangled state before being measured, that is, they represent multiple states at the same time, for example, a quantum state can represent two numbers of 0 and 1 at the same time, and 7 such quantum states can represent 128 states or 128 numbers at the same time, that is, 0~127. Such a transmission of optical quantum communication is equivalent to 128 times of traditional communication methods, and it is conceivable that if the transmission bandwidth is 64 bits or higher, the difference in efficiency will be amazing.

Of course, many people may not be able to understand quantum entanglement, which can be helped by "Schrödinger's cat": when a cat is placed in a box with poison, and then the box is closed, after a while, the cat is asked whether it is dead or alive?

The answer to quantum physics is: it is both dead and alive. Some people will say, open the box and look at it, yes, open the box cat is dead or alive will indeed know, but according to the explanation of quantum physics: this dead or alive state is the result of human observation, that is, the macroscopic interference of people makes the cat dead or alive, not the real state when the box is covered, the same way, the microscopic particle has been in the superposition of the two states of "dead" and "alive" before it is not "disturbed", it can also be said that it is both "0" and "1", Therefore, the guarantee of quantum communication technology in terms of security is very reliable.

Because of this characteristic of quantum entanglement, even if you intercept the information, because of the characteristics of entanglement, when you artificially crack the information macroscopically, it will immediately change the quantum state and cause it to collapse, so the information obtained by the thief due to interference has been destroyed and is not the original information.

Quantum communication technology has three characteristics: real-time, security, and efficiency, any of which are not possessed by traditional communication technology.

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