Microwave-activated quantum state transfer and entanglement generation among five to seven qubits

Abstract We propose a scheme for the rapid and high-fidelity transmission of quantum states and the generation of entanglement among at least five qubits in a circuit quantum electrodynamics system, based on optimized microwave-driven pulses. By designing appropriate microwave pulses applied to the qubits, quantum state transfer among five or more qubits can be realized, enabling bidirectional transfer and control over the residence time of quantum states on any arbitrary qubit by adjusting the parameters of the driving pulses. Furthermore, by optimizing the microwave pulse parameters, the scheme facilitates the creation of entangled states involving five or more qubits in a time-efficient manner. Additionally, we evaluate the fidelity of the transferred quantum state and the generated entanglement, taking into account the effects of decoherence. The results demonstrate that the proposed scheme enables high-fidelity quantum state transfer and entanglement generation with minimal photon leakage from the cavity and energy relaxation of the qubits.