Efficient scheme for generation of photonic NOON states in circuit QED

TL;DR

This paper presents a fast and simplified method for generating photonic NOON states in circuit QED using a four-level superconducting device, reducing operational steps and experimental complexity.

Contribution

The proposed scheme significantly reduces the number of steps and simplifies the setup for NOON state generation in circuit QED compared to previous methods.

Findings

Requires only N+1 steps for NOON state preparation

Operates faster than previous methods with 2N steps

Simplifies experimental setup with fewer components

Abstract

We propose an efficient scheme for generating photonic NOON states of two resonators coupled to a four-level superconducting flux device. This proposal operates essentially by employing a technique of a coupler device resonantly interacting with two resonators simultaneously. As a consequence, the NOON-state preparation requires only $N+1$ operational steps and thus is much faster when compared with a recent proposal [Q. P. Su et al., Scientific Reports 4, 3898 (2014)] requiring $2N$ steps of operation. Moreover, due to the use of only two resonators and a device, the experimental setup is much simplified when compared with previous proposals requiring three resonators and two superconducting qubits/qutrits.