Dissipation-assisted steady-state entanglement preparation in a hybrid quantum system

Abstract

Hybrid quantum systems that integrate complementary advantages of different physical platforms provide a new pathway toward large-scale, fault-tolerant quantum information processing. In this work, we theoretically investigate a hybrid system consisting of a Rydberg atom, a piezoelectric nanomechanical resonator, and a superconducting qubit, aiming to achieve high-fidelity steady-state entanglement. In this scheme, the nanomechanical resonator acts as a quantum bus, resonantly coupling to the superconducting qubit via the piezoelectric effect and to the Rydberg atom via the electric dipole interaction. Under the strong-coupling condition, we introduce a dressed-state transformation to analyze the eigenenergy structure of the system. By properly controlling the laser driving fields, the otherwise detrimental dissipation processes are turned into a crucial resource for entanglement preparation. Numerical simulations show that under optimal parameters the fidelity of the target state can reach above 98%, and the scheme exhibits strong robustness against fluctuations in the driving field strengths and against spontaneous emission noise. This study provides a feasible theoretical approach and technical reference for cross-platform quantum interfaces, distributed quantum computing, and dissipation-assisted quantum state engineering.