Parametric frequency converters (PFCs) play a critical role in bridging the frequency gap between quantum information carriers. PFCs in the microwave band are particularly important for superconducting quantum processors but their operating bandwidth is often strongly limited. Here, we present a multimode kinetic metastructure for parametric frequency conversion between broadly spanning frequency modes. This device comprises a chain of asymmetric kinetic inductance grids designed to deliver efficient three-wave-mixing nonlinearity. We demonstrate highly efficient coherent conversion among broadly distributed modes and the mode frequency is continuously tunable by controlling the external magnetic field strength, making it ideally suited for quantum computing and communication applications requiring flexible and efficient frequency conversion.

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• Frequency conversion
• Photon pairs & parametric down-conversion
• Quantum information with hybrid systems
• Quantum interconnects
• Quantum state transfer
• Metamaterials
• Superconducting devices
• Transducers