Controlled Phase Shift gates
This is a family of phase shift gates (again based on ¯) that use two qubits. Both exert control over the outcome in that, if either is zero, both of the outputs are inputs are output. However, if both are set to one, both of the input qubits are shifted by ei¯. This has the computational effect of making two qubits that are in phase with each other move into another phase together (for the reasons outlined in the phase shift gates section above). Below is a diagram for this gate.
Return to Introduction
Created by Brian Patterson
Last Modified 11/22/00