Circuit QED: Generation of two-transmon-qutrit entangled states via resonant interaction

TL;DR

This paper proposes a fast, controllable method to generate entangled states of two superconducting transmon qutrits using resonant interactions in circuit QED, without the need for auxiliary systems or identical coupling constants.

Contribution

It introduces a simple, experimentally feasible scheme for creating tunable entangled states of two transmon qutrits via resonant interaction in a single cavity.

Findings

Entanglement can be controlled from partial to maximal.

The method is fast and does not require auxiliary systems.

Applicable to natural or artificial atoms in optical or microwave cavities.

Abstract

We present a way to create entangled states of two superconducting transmon qutrits based on circuit QED. Here, a qutrit refers to a three-level quantum system. Since only resonant interaction is employed, the entanglement creation can be completed within a short time. The degree of entanglement for the prepared entangled state can be controlled by varying the weight factors of the initial state of one qutrit, which allows the prepared entangled state to change from a partially entangled state to a maximally entangled state. Because a single cavity is used, only resonant interaction is employed, and none of identical qutrit-cavity coupling constant, measurement, and auxiliary qutrit is needed, this proposal is easy to implement in experiments. The proposal is quite general and can be applied to prepare a two-qutrit partially or maximally entangled state with two natural or artificial atoms of a ladder-type level structure, coupled to an optical or microwave cavity.