Bright Sword starts with the grenade flat.

Chapter 446 David Out of Control

Although entangled electrons can sense each other instantly, this does not mean that quantum entanglement can achieve superluminal information transmission.

To be precise, the entire process does not transmit any information, because no matter how you observe one of the electrons, next to the other electron, you can never know that I am observing the electron, nor can you know any operation I have on the entire electron.

Because no matter how one of the electrons is observed, the result for the other electron is "half probability of upward spin and half probability of downward spin."

That's right, in the era before Liu Xiu traveled through time, observation was possible but super-control was impossible, because if you want to control the quantum, it will destroy the quantum entanglement effect. Therefore, the difficulty in achieving superluminal communication lies in how to achieve it without destroying the quantum entanglement effect while being able to control a piece of quantum to allow it to transmit information to another quantum.

Since quantum entanglement cannot transmit any information, what exactly did the quantum communication that was very popular before Liu Xiu traveled through time mean?

In fact, "quantum communication" can easily lead to misunderstanding if understood literally. A more rigorous name should be "quantum encryption communication" or "quantum key distribution." It is not the quantum entanglement that many people think can achieve superluminal communication.

It is actually a secure way to transmit keys, which can send keys between two distant communication terminals. In the process of confidential communication, keys are needed to encrypt and decrypt information. The security of the keys ensures the security of the information, and the keys can be obtained through the principle of quantum entanglement.

Unlike traditional encryption methods, quantum key distribution is theoretically absolutely secure, and its security is guaranteed by the basic principles of quantum mechanics. Quantum states are not replicable, and it is impossible to perfectly clone any quantum state. Therefore, any eavesdropping on the quantum key distribution process may change the quantum state itself, making the eavesdropping discovered.

The traditional way of encrypting information, even if it is a randomly generated password, is actually "pseudo-random" in nature, because any random behavior in reality is "pseudo-random" and not truly "random". Even a few numbers that seem to come out of your brain at random are not truly random.

Of course, in theory, a sufficiently powerful computer can certainly crack the password of traditional information through exhaustive enumeration.

However, it will never be possible to crack information encrypted by "quantum key distribution" because the quantum state is a truly random state and cannot be copied.

Of course, nothing is absolute. Perhaps the randomness of quantum states also follows certain laws, but this law has not been discovered by quantum physicists on the Wandering Blue Planet so far.

Of course, in the quantum science of the world before Liu Xiu traveled through time, in addition to the more popular pseudo-quantum communication such as quantum key distribution, quantum entanglement has an even more anticipated application, quantum stealth transmission.

As for what quantum teleportation is, this thing has similar plots in many science fiction novels and movies. In layman's terms, it is a teleportation device that uses quantum teleportation to achieve instantaneous teleportation of people and objects.

Of course, this is just an application of information faster than the speed of light. It is actually very easy to understand. Let’s use Liu Xiu’s current situation as an analogy.

For example, Proxima Centauri, where the Wandering Planet is now located, is more than a hundred light years away from Origa VI, the first colony planet of humans on the Wandering Blue Planet.

What should Liu Xiu do if he wants to go to this planet to do something? A relatively simple way is to clone a Liu Xiu on Origa VI, and then use the consciousness information to read and transmit Liu Xiu's consciousness information to the clone of Liu Xiu on Origa VI.

So, to a certain extent, Liu Xiu was equivalent to teleporting more than a hundred light years in an instant, but the transmission of this information actually had no meaning.

It would be better for Liu Xiu to use a holographic controller and then place a robot on the Origa VI planet. Of course, although the world before Liu Xiu traveled through time had discovered the superluminal phenomenon of quantum entanglement, the reason why this superluminal information communication could not be used was actually the biggest problem of how to control one of the two quanta without destroying the quantum entanglement and let the other quantum transmit the signal.

Of course, this does not mean that quantum encryption technology is useless. After all, quantum encryption technology at least solves the observation problem of quantum communication.

After the entire Wandering Blue Star shook slightly, an electromagnetic cannon shell with a speed of 90% of the speed of light was launched towards the center of the Milky Way.

Rather than calling it an electromagnetic cannon shell, it is more like an unmanned exploration spacecraft, because this electromagnetic cannon shell not only has a changing propulsion device, but also a reverse thrust device for deceleration.

In addition, the electromagnetic cannon shells, which are only a hundred meters in diameter, are also loaded with a large amount of antimatter to provide propulsion energy for these engines.

The most important of these is naturally the curvature engine used to enable electromagnetic cannon shells to achieve superluminal speed. Only when the curvature engine is installed on the electromagnetic cannon shells can the electromagnetic cannon fly at a speed of ninety times the speed of light.

Without the hundredfold amplification of the curvature engine, the electromagnetic cannonball could only fly at 90 percent of the speed of light.

Although this flying speed seems very fast, in fact, in the universe that is hundreds, tens of thousands, hundreds of thousands or even hundreds of millions of light years in size, the speed can only be described as that of an ant crawling.

What Liu Xiu didn't expect was that just after Liu Xiu watched the electromagnetic cannon shell being launched, Tu Hengyu ran over with a pale face and told Liu Xiu that David was out of control.

That's right, David on the Covenant, who was released by Liu Xiu, actually lost control. Originally, Liu Xiu looked at the more than 2,000 humans in the hibernation chamber on the Covenant and did not order the destruction of the Covenant because they were also human beings.

Instead, he let Tu Hengyu use the intelligent virus implanted in the brain of David, the bionic man, to control David, let David drive the Covenant back to the alien blue planet, and then control David to delete the data in his brain, and finally completely destroy David's intelligent program.

However, Liu Xiu still overestimated Tu Hengyu, or underestimated the power of artificial intelligence. Although the artificial intelligence program of David, the bionic man, was tightly controlled by Tu Hengyu's virus program in the early stage.

But what Tu Hengyu didn't know was that while Tu Hengyu was manipulating the intelligent virus program to control David's body, David's artificial intelligence program was actually secretly analyzing and cracking Tu Hengyu's intelligent program.

So when Tu Hengyu controlled David to drive the Covenant spacecraft back to the star system where the alien blue planet was located, and when Tu Hengyu, who had completed the mission, was about to control David to self-destruct, the intelligent program in David's mind finally fought back.

After years of analysis, David's artificial intelligence program naturally found the weakness of Tu Hengyu's control virus, and naturally succeeded in regaining control of the bionic body.

Fortunately, although David's intelligent program regained control of his body, it was temporarily unable to do anything about Tu Hengyu's monitoring program.

(End of this chapter)