Superconducting qubits

Understand

From a physicist's standpoint, the most interesting part of quantum computing research may well be the possibility to probe the boundary between the quantum and the classical worlds.

• The more macroscopic are the structures involved, the better.
• So far, the most "macroscopic" qubit prototypes that have been studied in the laboratory are certain kinds of superconducting qubits.
• To get a feeling for how macroscopic these systems can be, the states of flux qubits which are brought in a quantum superposition corresponds to currents composed of as much as 10^5-10^6 electrons flowing in opposite directions in a superconducting loop.