Efficient generation of NOON states on two microwave-photon resonators

TL;DR

This paper proposes an efficient and experimentally feasible method for generating NOON states in microwave resonators using a superconducting charge qutrit, improving speed and reducing implementation complexity.

Contribution

The scheme introduces a faster, high-fidelity method for NOON state generation that avoids long-time occupation of the third excited state, unlike previous approaches.

Findings

The scheme achieves high-fidelity NOON state generation.

It is faster and easier to implement than previous methods.

The approach reduces the difficulty of experimental realization.

Abstract

We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit. It is completed with two kinds of manipulations, that is, the resonant operation on the qutrit and the resonator, and the single-qubit operation on the qutrit, and they both are high-fidelity operations. Compared with the one by a superconducting transmon qutrit proposed by Su et al. (Sci. Rep. 4, 3898 (2014)), our scheme does not require to maintain the qutrit in the third excited state with a long time, which relaxes the difficulty of its implementation in experiment. Moreover, the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator, which makes our scheme faster than others.