After a series of certification procedures, Kangchi finally returned to his laboratory, and saw the familiar scene inside that was cleaned and sorted out spotlessly by the white girl, Kangchi couldn't help but breathe deeply.

In the past few days, the engine has also been tested, the aircraft has been driven to the fullest, and even supersonic flight has been experienced, and then a new research will finally begin.

And it's a very challenging project.

He walked over to his desk and sat down, looking at the various materials and drafts on the table, which were still in the same position as when he left.

There are many traditional ways of communication, for example, if Xiaoshuai wants to confess to the goddess, he can directly write a letter to the goddess in person, or he can call her on his mobile phone to tell her, and he can also send her an email.

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If the stealer wants to get the data, he has to steal the sending wave for observation, which will not only immediately make the two sides of the exchange find out that someone has stolen it, but also because of the uncertainty of the quantum, the data obtained by the stealer is also garbled and has no value.

Therefore, many people believe that using the principle of quantum entanglement, faster-than-light communication technology can be realized.

For example, A and B, one person takes a quantum in an entangled state, and then A takes a spaceship to find alien life, and at the same time agrees that if the spin is down, the alien has been found, and if the spin is up, it is not found.

For example, traditional communication is through radio waves, or the wavelength of visible light, to complete the transmission of 0 and 1 data, if someone else finds your transmission frequency, it is easy to get a series of the same data, and then decrypt it.

In fact, when developing the turbofan 30, Kangchi took the time to read all the information related to communication technology that could be found, and determined a general research direction.

However, quantum encryption, although it also emits waves through radio waves (photons, quanta, almost all particles are essentially a wave), can make each wave contain data, and each wave is in an uncertain state of 0 and 1.

The rest of the problems, which no one can prove right or wrong, have become a world problem, and solving any one of them can cause a sensation in the international academic community.

It's a painful process.

You can proudly call yourself a scientist and go down in history!

But the problem is that at this stage of technological development, it is actually very difficult to come up with a conjecture that has never been put forward before, because most of the conjectures that are brain-opening are easily proven wrong in the end, and those that are proven to be correct have become the truth.

So in case of indecision, quantum mechanics, this is when quantum entanglement can come in handy.

As early as 22 years ago, Professor Long's team at Beijing University achieved quantum direct communication at a distance of 100 kilometers, which was more than five times longer than the second place.

But Xiaoshuai was more shy, he was afraid that others would know about confessing this, so he gave the goddess a codebook in advance, and then sent a string of Morse code to the goddess, and the goddess immediately understood by comparing the codebook, it turned out that Xiaoshuai liked herself.

Although the chubby girl can clean and tidy up the laboratory, the three meters around this desk is its forbidden area.

But with the improvement of the computing power of modern computers and the emergence of quantum computers, this password has become insecure, and Xiaoshuai's confession may still be deciphered by his roommate who peeps at the screen.

Quantum entanglement refers to two quanta A and B that are entangled with each other, and no matter how far apart they are, they can produce a kind of linkage.

In this way, it can already prevent most people who peep at the screen from knowing the meaning of Xiaoshuai's transmission, but this is not enough insurance, so it can continue to upgrade the codebook, such as using a large string of prime common factors of numbers as the agreed password, and the difficulty of cracking will suddenly increase by one level.

Therefore, although it is possible to complete the faster-than-light transmission of information through two entangled quanta, they are all invalid information, which is like a chain of suspicion, falling into an endless loop.

2605: F 700: 43: 6000:: 70d

If you can come up with a conjecture that no one has ever put forward and eventually be proven to be right.

Pick up the draft at the top and look at the lines that I wrote when I had time out some time in front of me:

No matter how far apart the two spins are, as long as a·b≠0 (not orthogonal), they are correlated with the projection measurement results on a and b, both of them measure the z(or x) direction spin, Q(z, z)=-1=Q(x, x), and when the two directions measured are perpendicular to each other, the correlation function is 0......

As time passed, some of the scratch paper full of calculations was thrown on the ground by him, and some were pasted on the whiteboard.

But in fact, the moment it is observed, the randomness of the quantum spin direction ends, it has collapsed to an eigenstate, and then the same observation is made again, and the result is the same.

However, because the direction of the quantum spin is really random, A cannot control whether the quantum spin is up or down at all, so the message transmitted through observation is invalid.

Some people may say, who wouldn't open their minds?

This uncertainty of data is the principle of quantum entanglement.

If we want quantum communication in the true sense, we have to mention pseudo-quantum communication, which has entered the practical application stage.

He and Ren Zhou's thoughts actually coincide, electromagnetic communication is definitely not safe enough, he must find a new forest, for now, Kangchi thinks that the most likely, in fact, is the real sense of quantum communication.

What Kangchi needs to do now is to find the theoretical loophole of this endless loop.

Even if you increase the number of entangled quanta that carry each other, the result will be the same, and even because it collapses after looking at it once, both sides don't even know who measured it first, and who wants to pass the information to whom.

Before the observation, the spin direction of the two quanta is random, in a superposition of upward spin and downward spin, but if quantum A is observed, it will collapse instantaneously and become a fixed downward or fixed upward spin.

And if the spin direction of quantum A is observed to be upward, then the spin direction of quantum B will also collapse downwards at the same time.

After thinking for a moment and recalling for a moment, Kangchi began to write down the line, and it was a morning to write.

It's a bit like playing with one-two-three wooden figures, and that observer, who also has the petrification effect of Medusa, turns people into statues after playing once......

In fact, the current quantum communication can only be said to be quantum secure communication, and this technology is currently in the leading position in the world.

In the past, physics used to observe phenomena through experiments and summarize conclusions, but when the laws of the macrocosm were summarized almost completely, after entering the microcosm, it gradually became a conjecture and a search for phenomena to be confirmed.

It turns out that it is so easy to become a scientist!

In fact, it's that easy.

And the cost of thought experiments is also very low, high-energy physics needs to spend tens of billions to build a particle collider, but to study quantum mechanics, you may only need five steamed buns a day!

On the contrary, Kangchi hopes that this thing can be solved by spending money to make things.

But the problem is that theoretical research is so metaphysical that if you don't have a viable theoretical direction, you don't even know what to make.

It's like going out, if you don't even have a destination and direction, how do you know what kind of transportation you need?

(End of chapter)