One-step multi-qubit GHZ state generation in a circuit QED system

TL;DR

This paper presents a one-step method for generating GHZ entangled states in a circuit QED system, which is fast, robust, and independent of initial states, suitable for superconducting qubits.

Contribution

The proposed scheme enables rapid, robust GHZ state generation in circuit QED without requiring specific initial states or mode tuning.

Findings

GHZ states produced within qubit coherence times

Scheme is robust against operation errors and noise

Independent of initial resonator state

Abstract

We propose a one-step scheme to generate GHZ states for superconducting flux qubits or charge qubits in a circuit QED setup. The GHZ state can be produced within the coherence time of the multi-qubit system. Our scheme is independent of the initial state of the transmission line resonator and works in the presence of higher harmonic modes. Our analysis also shows that the scheme is robust to various operation errors and environmental noise.