Quantum supremacy- What is that?


Google has recently announced this fall to its fanfare that it had already demonstrated “Quantum Supremacy” which can perform a specific quantum computation better than classical computers. Though IBM has critiqued this claim by saying that their own supercomputers could perform the computation with greater fidelity. They have claimed nearly the same speed for classical computers.

Practically Google’s announcement was taken “with large dose of skeptism” and this was not the first time when someone cast a doubt against quantum computing. Previously a theoretical physicist “Michel Dyakonov from university of Montpellier in France “written an article about supercomputers. This was considered as flagship journal of computer engineering.

So, what is going on?

Now the question is, how to understand; what is going on? Due to inevitability of random errors with in the hardware. Unlikely, useful quantum computers are ever to be built.

What is a quantum computer?

Before you jump in to “why”, you need to understand how these quantum computers work. As they are fundamentally different from well known classic computers. Classical computer uses the binary code to store the data and these numbers could be voltages on logic circuits. At the same time quantum computers work on quantum bits, these bits are also called “qubits”. These qubits look like wave and they have amplitude with phase like traditional waves.

Qubits has special properties and they can be in super position. In this superposition they are both 0 and 1. Sometime they can be entangled, and they share physical properties even if they are separated by large distance. Though this behaviour doesn’t exist in classical physics.  In quantum physics this superposition get vanishes when the experimenter interacts with each other. Based on superposition a quantum computer with minimum 100 qubits can display 2100 solutions simultaneously.