## What is it?

**Quantum computing** studies computation systems (**quantum computers**) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data.

- Quantum computers are different from binary digital electronic computers based on transistors. Quantum computation uses quantum bits, which can be in superpositions of states rather than encoding of data into bits.
- A Quantum Turing machine is a theoretical model of such a computer, and is also known as the universal quantum computer.

- It takes advantage of the strange ability of subatomic particles to exist in more than one state at any time. Due to the way the tiniest of particles behave, operations can be done much more quickly and use less energy than classical computers.

## How it is useful?

Quantum computers uses qubits which are combination of bits. Consider an electron that either in the position of Stop(0) or on motion(1). This is the principle followed by our computers. But in quantum computers, a new state is introduced called * Superposition*. It is the state where both 0 and 1 exists at the same time. Therefore, the cases in which the inputs will be are 00, 01, 10 and 11.

Now we can see that one qubits can hold information of 2 bits. This is interesting right? Also, another interesting matter between these bits is the concept of * Entanglement*. It is the concept in which both the classical bits in a single quantum bit is connected. In simple words, two classical bits in a quantum bit is subject to change if one of its pair changes.

## Why it is not replaced?

Qubits do not make the things work faster but it make multiple things to work faster when combined.

The speed of a classical computer and quantum computer is same on opening a MS word document but the speed of quantum computer won’t be slow on editing 50 MS Word documents which makes the classical computers slow.

## Is it existing?

Yes. Quantum computers are not different in physical structure but it is a processor.

NASA and Google are currently using quantum computers for their research and development purposes. D’ WAVE is the quantum computing company who were in research on making computers to think.

Quantum computers are made to solve unanswerable question like ‘what is the factorial of 500?’ or ‘Are we alone?’. Next time, when you see a quantum computer just don’t forget to ask a question to it.

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From,

Maria Irudaya Regilan J