Global Parametric Gates for Multi-qubit Entanglement

• URL: http://arxiv.org/abs/2601.01826v1
• Date: Mon, 05 Jan 2026 06:44:42 GMT
• Title: Global Parametric Gates for Multi-qubit Entanglement
• Abstract summary: We propose and experimentally demonstrate a global parametric gate that generates multi-qubit entangled states in a single step.<n>By applying a parametric drive to a common qubit at precise detunings relative to computational qubits, we directly produce two-, three-, and four-qubit entanglement with state fidelities of 99.4%pm0.2%.<n>This scheme enables efficient, reconfigurable control using only microwave drives and is compatible with fixed-frequency qubits.
• Score: 18.17425260786108
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose and experimentally demonstrate a global parametric gate that generates multi-qubit entangled states in a single step. By applying a parametric drive to a common qubit at precise detunings relative to computational qubits, we directly produce two-, three-, and four-qubit entanglement with state fidelities of 99.4\%\pm0.2\%, 93.4\%\pm0.3\%, and 91.4\%\pm0.3\%, respectively. This scheme enables efficient, reconfigurable control using only microwave drives and is compatible with fixed-frequency qubits. Error analyses indicate that infidelity stems primarily from decoherence and coherent control errors, with negligible contributions from static ZZ coupling and flux noise. Furthermore, simulations with state-of-the-art parameters predict this global gate can generate high-fidelity (99.70\%) entanglement in systems of up to six qubits.

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