Time-frequency Entangled Photon Mediated CCZ Gate

Abstract: High-fidelity native multi-qubit operations are crucial to efficient quantum circuit compilation due to their ability of shortening circuit depth and enhence the performance. However, the design and implementation of these gates remain a challenge. Here, we demonstrate a hardware-efficient scalable scheme for direct CCZ gate implementation based on two-photon absorption phenomenon, which is applicable to current superconducting quantumcomputing platforms. By carefully optimizing the parameters of qubits and couplers, we achieve a simulated fidelity over 99% within 194ns, surpassing the decomposed methods with single-qubit and two-qubit gates in both latency and overall fidelity. Crucially, the scheme is robust against parameter drifts and can be extended to CCPhase({\theta}) gates with arbitrary angles and multi-qubit operations. All these results highlight the advantages of our scheme which paves the way for substantial depth compression of complex quantum circuits for practical application in transformative quantum algorithms and simulations.