Hello. It is @hunhani.

Thank you for your interest and support in Chapter 0. Introduction. I will do my best to meet your expectations.

Chapter 1. Quantum computer! What the hell is different with ordinary computer? This time, we will have a time to learn about the basic principles of quantum computers compared to ordinary computers.

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Quantum computer is not simply a fast computer.

Quantum computer is not just a computer capable of fast operation. The computing system itself is totally different. It operates in a completely different way from the traditional computer.

As well as the personal computers we usually use, supercomputers of the highest performance are also based on classical information processing. In classical information processing, all states are decided and changed uniquely. Speaking easily, it is basically a way that only one step can be operated at a time. In this case, the minimum unit of operation is 0 and 1 bit. The bit can only be 0 or 1 at a time, and can not have both at the same time.

▲ IBM Supercomputer Blue Gene

The supercomputer maximizes the computational power itself by using a parallel computing method that connects multiple processors and processes them at a time. It is an improvement on the architecture and algorithm of the existing processor. However, there is still a limit to the speed of information processing, because each processor still has its own unique operations.

A quantum computer is essentially different in structure and operation.

A quantum computer uses a state in which all possible states overlap and are entangled. What the hell is this? Let me explain something more.

A quantum state exists in a superposition state with different eigenvalues. Quantum mechanically, behaviors such as measurement or perturbation collapse the quantum states so that they are determined as a specific one of the allowed states. Nobody knows where the unique state will be determined. We can only estimate it probabilistically.

Summary

• Natural phenomena are determined by probability.
• Measurement or perturbation behavior itself affects the state.

Let's define the terms based on this.

• Quantum superposition : Quantum mechanical properties that exist simultaneously in all possible states that a particle can have in relation to energy or position.
• Qquantum entanglement : A state in which two or more quantum states are closely associated with one another. In the entangled state, states are inevitably determined depending on the fact that the other states are determined even in the separated physical system.

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When there are two or more particles, the entanglement is caused by the superposition of states. This is the most important phenomenon in quantum mechanics and the first step to understanding how quantum computers work.

Next time, we will deal with the magical phenomena of nature caused by quantum superposition and quantum entanglement, especially the measurement of quantum states and quantum teleportation.

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I want to deliver it as easily as possible, but this topic is very difficult for everyone. If you comment your question, I will reply to you as easily and concisely as I can.

The following chapter is introduced.

Chapter 2. Magical phenomena of nature, Quantum Superposition & Entanglement

Please do not take your eyes off!

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• All images used in this post are from Google Images.

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# YHH

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