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QI: Fachverband Quanteninformation

QI 5: Implementations: Solid State Systems

QI 5.2: Hauptvortrag

Dienstag, 21. September 2021, 14:30–15:00, H4

Quantum information processing with semiconductor technology: from qubits to integrated quantum circuits — •Menno Veldhorst — QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

Quantum computation with quantum dots has now been studied for more than two decades after the original proposal by Loss and DiVincenzo. Developments have been across the full-stack. Materials science progressed from GaAs heterostructures, to silicon, and most recently to strained germanium. These advances led to demonstrations of single qubit gates with fidelities close to 99.99%, high-fidelity two-qubit gates, and culminated in the realization a four-qubit quantum processor where qubits are positioned in a 2x2 array.

In this talk I will present the past achievements made with semiconductor qubits, highlight the current state-of-the-art, and provide a perspective on future efforts toward scaling to large-scale quantum computing. In particular I will focus on our efforts on germanium quantum technology, show implementations of rudimentary algorithms and initial error correction schemes such as the phase-flip code. Taken together, this talk provides an introduction to the field and motivates why semiconductor qubits are one of the most promising platforms for quantum technology.