"What radar technology is better?"

Qin Yi touched his chin and kept rummaging in the science and technology tower in his mind.

"The radar technology that is more suitable for your earth now should be quantum radar technology."

In the science and technology tower, the old man made a move, and a book fell into Qin Yi's hands.

"Quantum radar technology?"

Qin Yi was slightly stunned, then picked up the book and began to open it.

Anyone who has ever studied elementary school will know that the origin of radar is related to an animal called bats, which can fly freely in the dark of night, deftly avoid any obstacles, and can also hunt in the dark.

We all know this because bats rely on ultrasound waves emitted from their mouths, which travel through the air and bounce back when they encounter objects to be heard by the bat's ears.

Humans have studied the properties of bats and thus learned to use ultrasound to create radar for detecting objects flying in the air.

Of course, this is only the most primitive radar, and now radars in various countries around the world use radio wave technology, which emits a large number of radio waves to a specific area, and then uses Doppler frequency shift to detect targets.

The so-called Doppler shift is very common in real life, but often you may not notice, for example, the person behind the car hears a lower sound than the driver, because the car is moving, because the car is approaching, so the person in front of the car hears a higher pitch than the driver.

Using this Doppler shift, scientists have created more advanced radars that use high-frequency radio waves to detect objects flying in the air.

Of course, with the development of science and technology, lidar has also appeared, which can also be used to detect objects and targets by using the principle that the laser will reflect when it encounters an object.

However, whether it is a radar made of sound waves, electromagnetic waves, or lasers, it has its own limitations.

Whether it is sound waves, electromagnetic waves, or lasers, they are easily absorbed by some objects and are also very affected by the weather.

Especially for sound waves and lasers, once they encounter heavy rain, fog, heavy snow, etc., the sound waves and lasers will basically be absorbed cleanly, and they will not be able to accept it when they are emitted, and they will naturally become blind.

The so-called stealth fighters studied by various countries in the world are planes that use various technologies to weaken radar reflected waves, infrared radiation, and other characteristic information, so that the enemy's detection system will not be easy to detect.

At present, the methods of aircraft stealth mainly have the following three aspects: one is to reduce the radar reflective surface of the aircraft, from a technical point of view, the main measures are the design of a reasonable aircraft shape, the use of absorbing materials, active cancellation, passive cancellation, etc.;

The second is to reduce infrared radiation, mainly to take measures such as heat insulation and cooling for the parts of the aircraft that are prone to infrared radiation; The third is to use concealed colors to reduce the visibility of the naked eye.

The American F22 stealth fighter has almost achieved the ultimate in this aspect, the aircraft's own radar reflecting surface is extremely small, and the aircraft's display has a special coating that can absorb electromagnetic and sound waves, coupled with excellent design.

This F22 stealth fighter is almost like no one in the world, and there are very few means to find it, becoming a representative work of the world's stealth fighter.

Qin Yi naturally knows a little about radar technology, and he also knows the principles of their respective radar technologies, but this is the first time he has heard of quantum radar technology.

"Old man, I know this quantum communication technology, and what is the working principle of this quantum radar?"

While reading a book, Qin Yi communicated with the old man in his mind.

"The so-called quantum radar is a radar technology that uses quantum to image and detect the target, and when the quantum encounters the target, its quantum characteristics will be changed."

"Generally speaking, this is actually the principle of quantum entanglement, because of the characteristics of quantum itself, so quantum radar has a strong advantage that traditional radar does not have."

"It is very suitable for use in anti-gravity vehicles, which can accurately and quickly detect targets, so as to protect the safety of anti-gravity vehicles."

When it came to technology, the old man instantly turned into a teacher and began to explain the principles of quantum radar technology to Qin Yi in detail.

"If quantum radar can be studied, the so-called F22, Phantom and other fighters on your earth will definitely have nothing to hide."

"Because it uses the characteristics of quantum, no technology can interfere with or absorb its detection, and all stealth technologies will expose its face."

When he said this, the old man looked very confident.

"Quantum Entanglement~"

Qin Yi sighed slightly after listening, quantum technology is one of the most cutting-edge technologies on the earth, and quantum communication technology is a new generation of communication technology that countries around the world are trying to research.

"Isn't this just the right time to study and study quantum communication technology together?"

Qin Yi said with a smile.

"Quantum communication technology is a technology that must be mastered, and now the electromagnetic wave communication technology on your earth is certainly enough on the earth."

"But once you enter the interstellar universe, not to mention how far away, just in the solar system, the speed at which electromagnetic waves travel at the speed of light is too slow for the entire solar system, and the distance of 1 astronomical unit from the speed of light is almost 8 minutes, and there is a delay of more than ten minutes for communication back and forth."

"What's more, once you enter the vast and boundless universe, how many light-years are there at every turn, do you still want to rely on electromagnetic waves for communication at that time?"

The old man nodded, and said as a matter of course.

"Using the characteristics of quantum entanglement, quantum communication technology is completely real-time communication, theoretically speaking, no matter how far away, quantum communication is real-time communication, and there will be no delay."

"In addition, the characteristics of quantum entanglement, the confidentiality of quantum communication is extremely high, and the characteristics of quantum entanglement, once it is destroyed, will immediately change, and there is no need to worry about security."

Speaking of quantum technology, the old man began to talk eloquently again, talking about the advantages of quantum communication technology.

"Of course I know the importance of quantum technology, which can also be used to build quantum computers."

Qin Yi nodded, quantum mechanics is something that science dogs know, and they have naturally heard about the cutting-edge technology of quantum technology many times.

In the case of quantum communication, from time to time there are news reports that a certain institution or country has developed quantum communication technology, or has developed a powerful quantum computer or the like to attract people's attention.

"If you know, then hurry up and learn this book together."

The old man touched his beard and smiled with a teachable smile, and then with a casual move, another book appeared in Qin Yi's hand.

Qin Yi looked at the cover of the book, and the quantum theory was explained in detail.

"Now the quantum technology is thoroughly understood, once the quantum technology can be thoroughly understood, then quantum computers, quantum communications, quantum radar, etc. are not a problem."

"This quantum technology can be said to be the most important technology of the primary civilization, and its role is very large, and it is of great help to the exploration and navigation of the interstellar universe."

"First of all, you will thoroughly understand the theoretical things, and when your research institute of Galaxy Technology is built next year, you can study these technologies after you have all kinds of research equipment."

PS: The new book is pink. Ask for collections, clicks, and recommendation votes~