Generation of genuine $\chi$-type four-particle entangled state of superconducting artificial atoms with broken symmetry

TL;DR

This paper presents a robust scheme to generate a genuine four-particle entangled state of superconducting artificial atoms with broken symmetry, utilizing a transmission line resonator and adiabatic elimination techniques.

Contribution

The scheme introduces a novel method for creating a $$-type four-particle entangled state using cyclic three-level artificial atoms and a transmission line resonator, enhancing robustness against decoherence.

Findings

Successful generation of the $$-type four-particle entangled state.

Robustness against spontaneous emission and resonator decay.

Efficient scheme with simple operations for entanglement creation.

Abstract

We propose a scheme for generating a genuine $\chi$-type four-particle entangled state of superconducting artificial atoms with broken symmetry by using one-dimensional transmission line resonator as a data bus. The $\Delta$-type three-level artificial atom we use in the scheme is different from natural atom and has cyclic transitions. After suitable interaction time and simple operations, the desired entangled state can be obtained. Since artificial atomic excited states and photonic states are adiabatically eliminated, our scheme is robust against the spontaneous emissions of artificial atoms and the decays of transmission line resonator.