Chapter 272 Dead Loop
Chapter 272 Dead Loop
After a series of certification procedures, Kang Chi finally returned to his laboratory. Seeing the familiar scene of Bai Niu cleaning and tidying up the laboratory, Kang Chi couldn’t help but breathe a sigh of relief.
These days, the engine has been tested, the plane has been driven to its fullest, and even supersonic flight has been experienced. Next, it is finally time to start new research.
And it is a very challenging project.
He walked to his desk and sat down, looking at the various materials and drafts on the desk. They were placed in the same position as when he left.
Although Fatty can clean and tidy up the laboratory, the three meters around this desk is her restricted area.
Picking up the top draft, he looked at the few lines he had written on it some time ago: No matter how far apart the two spins are, as long as a·b≠0 (not orthogonal), the measurement results of their projections on a and b are correlated. Both sides measure the spin in the z (or x) direction, Q(z, z)=-1=Q(x, x). When the two directions of measurement are perpendicular, the correlation function is 0…
After a brief moment of thinking and recalling, Kang Chi began to write down, and he wrote for a whole morning.
In fact, when developing the turbofan 30, Kang Chi took the time to read all the information related to communication technology that he could find, and determined a general research direction.
He and Ren Zhou actually had some coincidences in their ideas. Electromagnetic wave communication is definitely not safe enough. He must find a new forest. For now, Kang Chi thinks that the most likely possibility is actually quantum communication in the true sense.
Speaking of quantum communication in the true sense, we have to mention pseudo-quantum communication, which has entered the practical application stage.
In fact, current quantum communication can only be called quantum secure communication, and China is currently in the leading position in this technology.
As early as 22 years ago, Professor Long’s team at Beijing University achieved quantum direct communication over a distance of 100 kilometers, which is more than five times longer than the second place.
There are many traditional ways of communication. For example, if Xiao Shuai wants to confess to the goddess, he can write a letter to the goddess in person, call her on his mobile phone, or send her an email.
But Xiao Shuai is shy. He is afraid that others will know about his confession, so he gave the goddess a code book in advance, and then sent a string of Morse code to the goddess. The goddess immediately understood by comparing the code book that Xiao Shuai likes her.
This method can prevent most people who peek at the screen from knowing what Xiaoshuai is conveying, but this is not safe enough, so it can continue to upgrade the code book, such as using a large string of prime number common factors as the agreed code, and the difficulty of cracking it will rise to a higher level.
However, with the improvement of the computing power of modern computers and the emergence of quantum computers, this code has become unsafe, and Xiaoshuai’s confession may still be deciphered by the roommate who peeks at the screen.
So when you are in doubt, quantum mechanics, quantum entanglement can come in handy at this time.
For example, traditional communication uses radio waves or visible light wavelengths to complete data transmission of 0 and 1. If others find your transmission frequency, they can easily get a series of identical data and then decrypt it.
However, although quantum encryption also transmits waves (photons, quanta, and almost all particles are essentially waves) through radio waves, it can make each wave contain data, and each wave is in an uncertain state of 0 and 1. Only when the two communicating parties use the agreed observation and decryption method can the information inside be correctly interpreted.
If the thief wants to get the data, he has to steal the wave that sends the message for observation. This will not only immediately let the two communicating parties find that someone is stealing, but also because of the uncertainty of quantum, the data obtained by the thief is also a garbled code, which has no value.
This kind of data uncertainty is the principle of quantum entanglement.
Quantum entanglement refers to two entangled quanta A and B, which can produce a linkage no matter how far apart they are.
Before observation, the spin directions of the two quanta are random, in a superposition state of spin up and spin down, but if quantum A is observed, it will instantly collapse and become fixed downward or fixed upward spin. And if it is observed that the spin direction of quantum A is upward, then the spin direction of quantum B will also collapse at the same time.Downward.
So many people believe that the use of quantum entanglement principle can realize superluminal communication technology.
But in fact, at the moment of observation, the randomness of the quantum spin direction ends, it has collapsed to an eigenstate, and the same observation is performed again afterwards, and the result is the same.
This is a bit like playing one-two-three-wooden man, and the observer also has the petrification effect of Medusa, and the person is turned into a statue after playing once…
For example, two people, A and B, each of them takes a quantum in an entangled state, and then A takes a spacecraft to look for alien life, and at the same time agrees that if the spin is downward, it means that aliens have been found, and if the spin is upward, it means that no aliens have been found.
But because the spin direction of the quantum is truly random, A cannot control whether the quantum spin is up or down, so the message transmitted through observation is invalid.
Even if the number of entangled quanta carried by each other is increased, the result is the same, and even because it collapses after one look, both parties don’t even know who measured first and who wants to pass information to whom.
So although it is possible to complete superluminal information transmission through two entangled quantum particles, all of them are invalid information, which is like a chain of suspicion, and falls into an endless loop.
What Kang Chi has to do now is to find the theoretical loopholes in this endless loop.
This process is quite painful.
As time goes by, some of the draft papers filled with formulas are thrown on the ground by him, and some are posted on the whiteboard by him.
Previous physics is to observe phenomena and summarize conclusions through experiments, but when the laws of the macroscopic world are summarized almost, after entering the microscopic world, it gradually becomes through conjectures and looking for phenomena to confirm.
To put it bluntly, conjecture is to open up your mind.
Maybe someone will say, who can’t open up their mind?
It turns out that it’s so easy to become a scientist! In fact, it is really that easy.
If you can come up with a conjecture that no one has ever come up with, and it is finally proved to be correct.
Then congratulations, you can proudly call yourself a scientist and go down in history! But the problem is that at the current stage of technological development, it is actually very difficult to come up with a conjecture that has never been proposed, because most of the conjectures that open up your mind are easily proven to be wrong in the end, and those that are proven to be correct have become the truth.
The remaining ones that no one can prove to be right or wrong have become world problems. Solving any one of them can make a sensation in the international academic community.
And the cost of thought experiments is also very low. High-energy physics requires tens of billions to build a particle collider, but studying quantum mechanics may only require five steamed buns a day! Kang Chi actually hopes that this thing can be solved by spending money to build something.
But the problem is that theoretical research is so metaphysical. If there is no feasible theoretical direction, you don’t even know what to build.
It’s just like you want to go out. If you don’t even have a destination and direction, how do you know what kind of transportation you need? (End of this chapter)