Dissipative entanglement generation between two driven qubits in circuit quantum electrodynamics

TL;DR

This paper introduces a protocol for generating entanglement between two driven qubits in circuit QED, leveraging a combination of Landau-Zener-Stuckelberg transitions and dissipation to achieve near-Bell states.

Contribution

It presents a novel entanglement generation method in circuit QED systems using driven qubits and dissipative processes, with tunable steady states close to Bell states.

Findings

Steady states can be tuned close to Bell states.

Entanglement is achieved through interplay of LZS transitions and dissipation.

Effective Hamiltonians reproduce resonance patterns.

Abstract

An entangled state generation protocol for a system of two qubits driven with an ac signal and coupled through a resonator is introduced. We explain the mechanism of entanglement generation in terms of an interplay between unitary Landau-Zener-Stuckelberg (LZS) transitions induced for appropriate amplitudes and frequencies of the applied ac signal and dissipative processes dominated by photon loss. In this way, we found that the steady state of the system can be tuned to be arbitrarily close to a Bell state, which is independent of the initial state. Effective two-qubit Hamiltonians that reproduce the resonance patterns associated with LZS transitions are derived.