Fast and simple scheme for generating NOON states of photons in circuit QED

We propose a fast and simple scheme for generating NOON states of photons in two superconducting resonators by using a single superconducting phase qutrit. Because only one superconducting qutrit and two resonators are used, the experimental setup for this sheme is much simplified when compared with the previous proposals requiring a setup of two superconducting qutrits and three cavities. In addition, this scheme is easier and faster to implement than the previous proposals, which require using a complex microwave pulse, or a small pulse Rabi frequency in order to avoid nonresonant transitions.