Prof. Stefan Filipp

Controlling superconducting qubits for quantum computing

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. In this presentation I will focus on superconducting qubits as one of the most promising platforms for quantum computing. To enhance their quantum processing capabilities we have systematically optimized the material parameters and reached several hundred microseconds coherence times. Furthermore, we have investigated optimal control methods and demonstrated high-fidelity single and two-qubit gates. Finally, by simultaneously coupling multiple qubits we could realize multi-qubit operations to efficiently create many-body entangled state. 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.