Dynamic generation of multi-qubit entanglement in the ultrastrong-coupling regime
Xin Liu, Qinghong Liao, Guangyu Fang, Shutian Liu · Scientific Reports · 2019
Abstract We propose a dynamic evolution protocol for generating multi-qubit GHZ states in the ultrastrong-coupling regime of circuit QED. By varying the time length of sequences, the protocol works for any coupling strength g/ωr ≥ 0.25. The time for generating the GHZ states in our protocol can be in the subnanoseconds. By taking into account realistic parameters of circuit QED, the degeneracy of fidelity due to decoherence can be as low as 0.02%.