Fast Dissipation-Induced Entanglement In Circuit-QED Using Parametric Interactions*

Dissipative state stabilization seeks to achieve accurate quantum state preparation without the strict timing required by gate-based methods. Recent works have shown how parametric interactions enable the realization of stabilization protocols which do not suffer from the tradeoffs between target state fidelity and preparation time that typically limit the protocols based on resonant driving [1]. In this talk, I will discuss the experimental realization of a parametrically-induced state stabilization scheme in a circuit-QED architecture, where we use novel state-selective parametric driving to prepare a Bell state as an exact dark state of the dissipative dynamics. Our device consists of two transmon qubits coupled to a common resonator with a flux-tunable SQUID coupler. Modulating the loop flux at multiple frequencies allows simultaneous Hamiltonian and dissipation engineering with coupling strengths on the order of tens of MHz. The modular design paves the way towards natural extensions of such schemes to multipartite stabilization.
[1] E. Doucet, F. Reiter, L. Ranzani, A. Kamal, Phys. Rev. Research 2, 023370 (2020).