Skip to content

Optimizing the coherence of hole spin qubits in group IV elements

Date: 2024-05-06
Time: 14:00
Venue: B412
Speaker: Dr. Zhanning Wang


Electrical control of quantum bits favors fast, scalable quantum computation. I will discuss the hole spin qubits in group IV elements, which offer full electrical control, fast operations, and long relaxation and dephasing times. At first sight, the coherence appears difficult to enhance if fast operations are desired using purely electrical means due to charge fluctuators. However, I will demonstrate theoretically that the external magnetic field can act as an additional control parameter that can strongly enhance the performance and coherence properties of this quantum computing architecture: two-qubit operations are fully tunable and spin relaxation can be almost entirely suppressed in a parameter regime in which dephasing due to charge fluctuations can be eliminated. These findings can be directly translated to ongoing experimental work on hole spin qubits, in which I will show that a decoherence-free subspace can be realized at special magnetic field orientations.


Zhanning obtained his PhD from the University of New South Wales in 2024. He is working as a postdoctoral research fellow at the University of New South Wales. Zhanning's research interests include spin-orbit coupling in 2D systems, hole spin quantum information, and quantum transport. He is actively working in all these areas.