Guo Dongling said as she walked, and Jiang Fan followed her and replied.

It didn't take long for Guo Dongling to take Jiang Fan to the dean's office.

There was a knock on the door, and the voice of a middle-aged man came from the room.

"Please come in. ”

Guo Dongling twisted the doorknob, pushed the door open, and said sideways: "Mr. Jiang, please." ”

The room was out, and the dean was out, and Tang Zhenhai was also there, there were five of them.

"Mr. Jiang. ”

Tang Zhenhai saw Jiang Fan coming, got up and nodded at him with a smile.

"Mr. Tang. ”

"Let me introduce to you, this is Mr. Jiang, everyone must have seen Mr. Jiang's ones yesterday, and I won't say more here. ”

"Mr. Jiang, this is Dai Jianzhong, the dean of the College of Science and Technology, and this is 。。。。。。 ”

Tang Zhenhai introduced their names one by one.

Jiang Fan nodded at them, he knew each other.

"Knowing that Mr. Jiang is here today, our Academy of Science and Technology has prepared our work in advance, I wonder if Mr. Jiang needs to take a break and then go and talk to them about quantum computers?"

"Mr. Dai, no need, let's go now. ”

"Okay, Mr. Jiang, Mr. Tang, please. ”

"Please. ”

Dai Jianzhong took them out of the office and went to the Science and Technology Research Center together.

Guo Dongling followed behind them, took out his mobile phone, and informed Mr. Jiang that they were here, and they were also starting to prepare.

When they came to the large conference room, there were already more than a hundred people sitting in the seats.

Dai Jianzhong invited Jiang Fan to the stage, and then introduced to everyone: "Hello everyone, this is Mr. Jiang, today we have the honor to invite Mr. Jiang to the Academy of Science and Technology to talk about quantum computers for us, everyone is welcome!"

Smack! Smack! Smack!

Fierce applause rang out.

Looking at these people, Jiang Fan bowed slightly, and after Dai Jianzhong finished speaking, he also said a few words, and then started.

A quantum computer is a kind of physical device that follows the laws of quantum mechanics to perform high-speed mathematical and logical operations, and to store and process quantum information.

Its basic laws include the uncertainty principle, the correspondence principle, and Bohr's theory.

It is commonly used in electronic products based on semiconductor materials, laser burning discs, nuclear magnetic resonance, etc.

Quantum characteristics may break through the limits of existing classical information systems in terms of improving computing speed, ensuring information security, increasing information capacity, and improving detection accuracy.

A 250-qubit memory (made up of 250 atoms) may store up to 2 to the 250th power, which is more than the total number of atoms in the universe currently known.

Attacking existing cryptography with quantum search algorithms, classical computing requires 1,000 years of computation, while quantum computers only need less than 4 minutes.

The quantum key system uses quantum states as the information carrier, and its security is guaranteed by the principle of quantum mechanics.

Based on the quantum teleportation process, multi-terminal distributed operations can be realized to form a quantum Internet.

Schrödinger "cat" and EPR paradox

The birth of quantum mechanics has profoundly changed human society: nuclear energy, lasers, semiconductors and other high-tech technologies that promoted social development in the 20th century all originated from quantum mechanics.

Then, does nature really operate according to the laws of quantum theory?

The side represented by Einz has always believed that quantum mechanics is not a complete theory and that "God does not play with dice", while the other side, represented by the leader of the GE Benhagen School, Bier, firmly believes in the correctness of quantum theory.

The wave-particle duality of quantum objects forces the introduction of wave functions (quantum states) to describe the state of quantum objects.

The famous physicist Fei Man once pointed out that the subtlety of quantum mechanics lies in the introduction of the concept of probability amplitude (i.e., quantum state).

In fact, it is this quantum state that originates from the bizarre nature of the quantum world, and it is this quantum state that has been the focus of long-standing heated debates about quantum theory.

Ordinary digital computers run on a binary system of 0s and 1s, called "bits".

But quantum computers are far more powerful.

They can be computed on qubits and can calculate values between 0 and 1.

Suppose an atom placed in a magnetic field rotates like a spinning top, so its axis of rotation can be either pointing upwards or downwards.

Common sense tells us that atoms may rotate upwards or downwards, but not both.

But in the singular world of quantum, the atom is described as the sum of two states, one upward-turning atom and one downward-turning.

In the wonderful world of quantum, every object is described using the sum of all the incredible states.

Imagine a string of atoms arranged in a magnetic field, rotating in the same way. If a laser beam shines on this string of atoms, the laser beam jumps off the group of atoms, quickly flipping the axis of rotation of some of the atoms.

By measuring the difference between incoming and outgoing laser beams, we have completed a complex quantum "calculation" that involves the rapid movement of many spins.

In mathematical abstraction, a quantum computer performs a computation with a set as the basic unit of operation, and an ordinary computer performs a computation with an element as the basic unit of operation (if there is only one element in the set, quantum computing is no different from classical computing).

Take the function y=f(x),x∈A as an example. The input parameter of quantum computing is the definition domain A, and the output value range B is obtained in one step, that is, B=f(A);The input parameter of classical computing is x, and the output value y is obtained, and it takes multiple calculations to obtain the value range B, that is, y=f(x), x∈A,y∈B.

Quantum computers have an unsolved problem that the output value range B can only randomly take out one significant value y.

Although the elements in output set B have been far fewer than those in input set A by directing undesirable outputs to an empty set, multiple calculations are still required when all valid values need to be fetched.

1. Quantum state, quatumState

2. ,,Quantumsuperposition

3. Qubit, Qubit

4. UnitaryTransformation

5. Quantum Logic, QuantumLogic

6. QuantumGate (corresponding to the traditional logic gate, in fact, it is some special positive transformation)

7. Quantum algorithm, quantumAlgorithm (of course, quantum computers can also implement traditional algorithms)

Whereas current computers deal with binary "bits" with only two states, 0 or 1, quantum computers use "qubits" to encode and compute.

A qubit can be 1, 0, or a certain superposition state of 1 and 0 at the same time (due to the difference in superposition weights, this superposition state can theoretically be infinite, but in practice it is difficult to adjust the weight, generally half of the weight or proportion).

Generally speaking, the states that a quantum computer can have at the same time are the exponentiation of 2 qubits. In the previous paragraph, the number of states in which 2 qubits are in the same place is 2 to the 2nd power, which is 4, and if there are 3 qubits, the number of simultaneous states is 2^3=8......