Abstract
We propose a dissipation-engineering method for generation and stabilization of a Bell state for two superconducting qubits in coupled circuit quantum electrodynamics architecture. In the scheme, the large dispersive qubit–resonator interaction and resonant photon hopping between resonators jointly induce asymmetric energy gaps in the dressed state subspaces for the qubits and the collective resonator photon modes. The target steady state is reached and protected by applying each qubit with two microwave drives, that perturbatively induce the specific dressed state transition, while simultaneously by employing the decay of the collective photon modes. Numerical simulation verifies that high-fidelity and long-lived two-qubit Bell state can be obtained (based on the recently available experimental parameters) and is robust against the potential fluctuation of the system parameters.
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Acknowledgments
This work is supported by the Major State Basic Research Development Program of China under Grant No. 2012CB921601, the National Natural Science Foundation of China under Grant Nos. 11374054, 11305037, and 11405031, the Natural Science Foundation of Fujian Province under Grant No. 2014J05005, and the funds from Fuzhou University.
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Appendices
Appendix 1
We introduce the non-local bosonic modes
to simplify the dynamics of the system. In the interaction picture with respect to \(H_\mathrm{o}+H_{\mathrm{p}{-}\mathrm{p}},\) we obtain the interaction Hamiltonian
Under the condition of \(J=\varDelta \) and \(\varDelta +J \gg g\), the bosonic mode \(c_1\) is resonant with the two qubits, while the bosonic mode \(c_2\) is largely dispersive with the two qubits. Therefore, the interaction Hamiltonian reduces to
Appendix 2
In Fig. 6, we illustrate the dressed states and the corresponding energy levels of the coupled qubit–photon system.
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Lin, J., Shen, LT., Wu, HZ. et al. Stabilizing a Bell state by engineering collective photon decay. Quantum Inf Process 15, 185–197 (2016). https://doi.org/10.1007/s11128-015-1169-8
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DOI: https://doi.org/10.1007/s11128-015-1169-8