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About this paper
Xuexin Xu, Siyu Wang, Radhika Joshi, Rihan Hai, Mohammad H. Ansari
Researchers at Forschungszentrum Jülich and RWTH Aachen University developed a Parity Cross-Resonance (PCR) gate, directly implementing a three-qubit ZZX interaction in fixed-frequency superconducting transmons. This gate, optimized through a hybrid framework, achieved fidelities exceeding 99% for GHZ state preparation and Toffoli-class logic, and over 90% for a controlled-ZZ gate for quantum error correction, thereby reducing quantum circuit depth.
Key insights
- Higher-order intrinsic interactions, like the ZZX term, can be actively engineered and repurposed as robust computational primitives rather than solely suppressed.
- Native multiqubit gates drastically reduce quantum circuit depth, mitigating error accumulation and decoherence, thereby enhancing the practical utility of NISQ devices.
- A hybrid optimization strategy combining analytical perturbation theory with gradient-free numerical optimization can effectively navigate complex many-body Hamiltonians to achieve high-fidelity multiqubit gates.
Summary by alphaXiv.
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