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Circulating current in a qubit Clockwise, anti-clockwise and superposition states are shown. |
Schrodinger’s cat Facing left and right and these superposition are shown. Can macroscopic scale object exhibit such superposition? |
Quantum coherent oscillation Quantum mechanical states are controlled by relative phase between two microwave pulses. |
Fast control of qubit coherence with phase shift method
A superconductor ring with Josephson junctions behaves as a quantum 2-level system and is expected to be a candidate for a quantum bit (qubit), which is a key ingredient of a quantum computer. The size of the ring is about 10μm, which is much larger than atoms or molecules but it still shows quantum nature of the 2-level system. The quantum superposition in such a macroscopic scale object is sometimes called Schrodinger’s cat. (Page 36)