The phase qubit is a superconducting device based on the superconductor-insulator-superconductor (SIS) Josephson junction, designed to operate as a quantum bit, or qubit. The phase qubit is closely related, yet distinct from, the flux qubit and the charge qubit, which are also quantum bits implemented by superconducting devices. A phase qubit coupled to a piezoelectric mechanical resonator was used to create the world's first quantum machine.
Read more about Phase Qubit: Introduction, Main Equations Describing The SIS Junction, The McCumber-Stewart Model, Nonlinear Inductor, Quantized Energy Levels
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