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We have looked at how a transistor works, the fundamental unit of classical computers, and how a quantum computer works in theory, taking advantage of quantum superposition to hold exponentially more information than classical computers. Now we look at the practical side of making a quantum bit, or qubit. How do you put it in a state where it is stable? How do you read and write information on it? These processes are described for a solid-state qubit – a phosphorous atom in a silicon crystal substrate. Both the electron and the nucleus of the phosphorous atom can be used as qubits.

Our universe is an amalgamation of different objects following a wide spectrum of sizes, ranging from the smallest particles to the jumbo astronomical objects. being able to perceive the nature and behavior of all these sizes has been one ultimate goal of mankind since ages. But, as a single medicine cannot cure all the diseases, Similarly, a single scientific theory cannot work well at all the scales. So where we can efficiently describe the motion of a billiard ball or the motion of the planets around the Sun, using the same laws we cannot describe the behavior of smallest entities in the nature. This is where quantum physics comes into picture. But what it really is? What led to the development of this theory and how is it different from classical physics? This is Q and A and here is the answer to the ques What is Quantum Physics?