The Large-Scale Quantum Socket: Mitigating Coherent Leakage

The race for larger number of operational physical qubits is growing. Current targets are in the realm of 50 qubits, though in the near future will be breaching the hundreds. To achieve such numbers, while maintaining operations with low error rates, extensible architectures with compatible packaging must be employed. To this end, we present the large-scale quantum socket. A package and chip of such size would normally lead to unwanted modes that will interfere with qubit operations, which we analyze in the context of qubit coherent leakage. To prevent these errors, we have developed two methods by which such box modes are detuned from operational frequencies. These methods are analyzed through electromagnetic field simulations confirming that the resonance frequency of the modes can be significantly increased through the optimal placement of installed three-dimensional wires, far higher than standard qubit frequencies. Finally, we show experimental results towards the implementation of a large-scale quantum socket.