Advanced Designs and Control of Superconducting Qubits

Quantum computers have the potential to solve complex problems efficiently. However, to unleash their full capability, complex quantum systems have to be manufactured, manipulated, and measured with unprecedented accuracy and precision. This presentation will focus on superconducting quantum circuits operating in the microwave regime as one of the most promising platforms for quantum computing. To enhance their quantum processing capabilities, we have investigated novel multi-mode circuits that allow us to decouple the qubit from their electromagnetic environment. Moreover, we have investigated advanced control schemes based on sub-harmonic drives generated by the intrinsic non-linearity of the quantum circuits. Finally, by simultaneously coupling multiple qubits, we could realize multi-qubit operations to efficiently create many-body entangled states. As a specific example, I will demonstrate a fractional state transfer protocol on a chain of superconducting qubits and discuss its potential use case for quantum simulations and parity readout.