UNSW Physics Student Seminar – Matt Donnelly

October 23, 2020 @ 10:30 am - 11:00 am

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Matt Donnelly

Three Dimensional Monolithic Control of Atomic-Scale Devices in Silicon

The spin of an electron bound to a phosphorus donor in silicon (Si:P) is a prototypical two-level quantum system proposed as a qubit for quantum computing. Fundamental operations (initialisation, read-out with single qubit and two qubit gates) required for using this system for quantum information processing have been demonstrated in the past decade, with attention now turning towards how to scale up this system to the large arrays needed to carry out practical quantum computations. A critical part of the solution to the scale-up challenge will be the use of all epitaxial three dimensional (3D) scanning tunnelling microscopy (STM) fabrication techniques. Such techniques will not only facilitate increased electrostatic control and tunability of the qubits but do so in a crystalline device environment with minimal charge noise in the device.

In this talk we will demonstrate the use of atomically precise STM lithographic techniques to control the electrostatic landscape in a monolithic Si:P device, and how 3D STM fabrication allows us to controllably and predictably manipulate this landscape. We will show control of quantum tunnelling in devices and explain why this is useful for developing reproducible quantum computing architectures.



October 23, 2020
10:30 am - 11:00 am
Event Category:


UNSW School of Physics