Phase gate of one superconducting qubit simultaneously controlling n qubits in a cavity

Abstract

We propose how to realize a three-step controlled-phase gate of one superconducting qubit simultaneously controlling n qubits selected from N qubits in a cavity (1<n<N). The operation time of this gate is independent of the number n of qubits involved in the gate operation. This phase gate controlling at once n qubits is insensitive to the initial state of the cavity mode and can be used to produce an analogous CNOT gate simultaneously acting on n qubits.

This paper arXiv:0907.4201 is the shorter (just four pages) version of our published paper arXiv:0912.4242 (which has 21 pages)