Quantum communication is a chicken, no Securities analyst says so well.

----turn from your own circle of friends

This year has been a lot of hype about quantum communications, among which the analyst's articles are riddled with errors, and can only be fooled by investors. I will not refute those mistakes, and the real technician can see them at a glance.

I have a lot of friends in the Circle of communication, network security experts, I will tell you my opinion, please correct me. In a word: "Out of the military, no one will pay for quantum communications."

When I first saw this concept, but also deep feelings, think of the year when I saw big Liu novels of the Green years. Feeling to feel, actually want to think Big Liu actually made an obvious technical error. Quantum technology is actually not able to achieve long-distance real-time communication. The basic principles of quantum communication and quantum computing are briefly shown below. Because of the limited time, I did not say in detail, but also the quantum mechanics of things I almost forgot.

First of all, the quantum commonly used to two characteristics, you have any questions about this and do not ask me, the characteristics of quantum mechanics is: and your real life in the concept of inconsistent, you feel incredible right.

1, the quantum superposition state: In the conventional computer, the information unit is represented by the binary 1 bits, it is not in the "0" state is in the "1" state. In binary quantum computer, except in "0" state or "1" state, it can also be in superposition state, superposition state is "0" state and "1" state of arbitrary linear superposition, it can be "0" state and can be "1" state, "0" state and "1" state each with a certain probability exists simultaneously.

A simple understanding is that a person from Beijing to Shanghai can walk a lot of roads, but in the end he can only choose one way to go. But quantum can go many ways at the same time, if you ask me why quantum has ubiquitous, I can only say I do not know Ah!

As you can see, quantum is a natural parallel computer. According to quantum theory, the particles will enter the overlapping state, that is, in two states at the same time, each quantum bit presents overlapping states 0 and 1. So the computational number of a quantum computer is 2 N, and n is the bit number of the quantum bit. Please note that this feature of quantum computing has already threatened our current mainstream encryption technology. For example, RSA based on factorization is very dangerous in the face of quantum computing. A simple logic is introduced from this point: in the near future, in a few years ' time, cryptographic algorithms will be compromised by quantum computation. The ideal security solution is "absolutely secure" quantum communication. Of course, I do not agree with this view.

Note: Quantum computing is a trend. Because now the chip has reached 14nm, will soon reach the limit of the existing theory (now in the 10nm process, and then small into the field of quantum). It's very promising, but it's not easy. Because you are facing the direct competition of the top international giants.

2. Quantum entanglement (quantum over-distance action): Two quanta in entangled state, regardless of the distance between two particles, the change of one particle will affect the other particle. In fact, a simple understanding: two quanta can cross space and affect each other's state.

The discovery of quantum entanglement is also very close to Einstein, and there is an interesting science story. Anyone who is interested will go online to search.

A: When it comes to quantum hyper-distance, the first thing we think of is interstellar communication, and now it's more difficult for us to control the Mars rover. Because our radio wave travels to Mars for about 4 minutes, this delay is too great. Quantum action can span space, that is, there is no delay, this is much better ah.

The reality is that, within the current quantum mechanics framework, a single quantum state cannot be fully known, and the two non-orthogonal quantum states of any given one cannot be distinguished. Thus, in the case of entangled microscopic particles, although the state of another particle changes immediately when one of the particles is measured, the theory itself forbids people to measure the change. The simple idea is that you can pass a bunch of numbers, but you can't control what numbers to pass.

B: Achieve secure communication. We learn the password, absolute security password: one password at a time, if each communication password is not regular and different, and the password and the length of the delivery content, such encryption can not be cracked. Quantum communication can provide such a password. Of course not, there are a lot of simpler implementation techniques.

The concrete realization of quantum technology I am not clear, but the price certainly not too low. Then there is a problem, who will pay for this price?

Many comments on the Internet: The quantum communication industry is expected to become a global market scale according other industries; China's "Quantum Science Experimental Satellite" will be launched timing, according to the national "13th Five-year Plan", the quantum communication and World Integration Information Network is included in the ten key promotion projects, two special funds are expected to support close to hundreds of billions ; Quantum communication is nurturing the next great company. It lists the benefits of quantum communication, but in fact there is only one benefit: encrypted communication. Other benefits I do not list, everyone on the Internet search, these benefits are all bluff people.

To say that the encryption of communication is no more important than the importance of understanding the history of the people know that the German two World War failed an important factor: the communication password was cracked. This has risen to the height of the country's survival, and of course it is important. But personal understanding: the failure of German cryptography lies not in technology, because Germany can easily get a password that the Allies cannot decipher. As long as the value of 5 Leopard tank Investment, Germany will be able to solve the encryption algorithm research and development technology issues. Decryption is always more difficult than encryption! The problem in Germany is the question of consciousness and intelligence, not the issue of cryptographic technology.

There is a common theory that we all know: the cask principle. The field of information security is more evident. Because an attacker would inevitably choose a weak field offense.  There's a lot of network security problems. PCs, servers, gateways, and even firewalls are infected, actively attacking the internal network. But I have not heard of anyone who has the ability to hack the mainstream encryption algorithm to get user information on the communication line. Some may say that the CIA might be able to crack the Chinese military's cryptographic algorithms. I don't know, and I can't guarantee it. Even if I promise, no one will believe! But I think it's a more practical solution to study a better encryption algorithm. One step back: The military might be interested in this "absolutely secure encrypted communication scheme" for quantum communications, after all, who doesn't want to be absolutely safe. But I think only the military will buy it. But the quantum communications can have a large market capacity, the Chinese military every year to take out 1000亿来 for quantum communications pay, ghosts do not believe. Why industries such as financial telecommunications do not pay for quantum communications, because communication line security is not their problem at all. Their problem is apt,ddos and so on. You want everyone to pay for a problem that doesn't exist, not the door.

Quantum communication is a chicken, no Securities analyst says so well.