Cavity-assisted quantum transduction between superconducting qubits and trapped atomic particles mediated by Rydberg levels

Abstract: In this work, we present an approach for transferring quantum states from superconducting qubits to the internal states of trapped atoms or ions. To achieve state transfer, we utilize the Rydberg levels of those trapped atomic particles, which interact indirectly with the superconducting qubits via their mutual coupling to a microwave cavity. We investigate two protocols for this transfer: resonant interaction between the cavity, the atom/ion and the superconducting qubit, and dispersive interaction. We analyze the robustness of the state transfer fidelity against various noise and damping mechanisms, including cavity decay, Rydberg state decay, and the relaxation and dephasing of the superconducting qubit. For experimentally demonstrated parameters of interaction strengths, dissipation, and dephasing, our scheme achieves fidelities above 95\%.