Classical computing relies on large arrays of robust miniaturized bits. Similarly, the development of useful quantum computing requires millions of low-footprint error-tolerant qubits. Current state-of-the-art superconducting qubits are not compatible with this approach as they rely on large device areas to increase qubit lifetimes and reduce noise. This limits the practicality of building a scalable superconducting quantum computer given size constraint. We explore an alternative to this limitation, where we predict both orders-of-magnitude reduction in qubit footprint and simultaneous improvement in qubit performance. Our approach relies on the integration of merged-element-transmon qubits and on-chip phononic metamaterials. The combination of miniaturization and phononic protection of transmon qubits predicts strong reduction in qubit dielectric loss, therefore potentially allowing a highly coherent compact superconducting qubit.
Project is currently funded by: State & Other Gov't