Quantum Supremacy - What is Quantum Computer?


Google quantum computer will perform a calculation that will be not possible for a classical machine. In numbers, if quantum computer carries out a specific calculation then the same calculation would take 10 thousand years to complete by todays supercomputer.
Quantum Supremacy - What is Quantum Computer?

A few days back I have read a news article “Hello quantum world! Google publishes landmark quantum supremacy claim”

I was wondering what exactly is “quantum supremacy” or quantum computer

After reading more it was clear that Google's quantum computer will perform a calculation that will be not possible for a classical machine. In numbers, if quantum computer carries out a specific calculation then the same calculation would take 10 thousand years to complete by today's supercomputer.

But again questions remain the same what exactly is quantum computer and how we can use it today and in the future. For computer science students we can say Quantum computers work in a fundamentally different way from classical machines: a classical bit is either a 1 or a 0, but a quantum bit, or qubit, can exist in multiple states at once. And for layman quantum computers can search huge unstructured databases or calculate large numbers in a very short time.

In real-world applications, it could help with the development of new pharmaceuticals, energy sources utilization, new ways to collect solar power, materials, in education as well as in defense. It could take decades for quantum computers to become useful for everyone.  We might have a quantum internet that sends highly secured information around as high-end encryption will be possible with quantum computers.

But you can’t replace your Mobile Phone or PC with a quantum computer the same way as you can’t replace your car with an aircraft carrier. Both are designed to do different things, despite the fact each of them is related to transportation in some way.

Classical computers allow you to play games, check your emails, surf the web and run programs. Quantum computers will, for the most part, perform calculations or simulations too complex for today’s computer which runs on bits. In other words, individual users will have almost no use for a quantum computer of their own, but ISRO, IITs, Defence, for example, absolutely will.

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