Phase Shift gates
The phase shift gates are another class of general-purpose transformations. It shifts the phase of the qubit by ¯ (set when the gate is used). This is typically done in order to align the phases of qubits for superpositioning or to intentionally weigh certain qubits to interfere (constructively or destructively) with other qubits. It works by multiplying the |1> part of the qubit by ei¯ (though, of course, multiplying the |0> part can be accomplished by using a NOT gate on the qubit, using the appropriate phase shift gate, and then using another NOT gate). The diagrammatic representation of the phase shift gate is below.
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Created by Brian Patterson
Last Modified 11/22/00