Superconducting Qubit

Abstract

Superconducting qubits are solid state electrical circuits manufactured using conventional techniques. Their main building block is Josephson tunnel junc- tion, the only non-dissipative, strongly non-linear electrical circuit element works at ultra low temperature. Here we discuss the Josephson junction and it’s characteristics which result in three basic electrical circuits using Joseph- son junction in three different combination, each of which act as a qubit i.e. Josephson junction qubit, Flux qubit, Charge qubit. Also we discuss the quantization of energy levels of each of the them and how their first two energy levels are used as qubit.