Princeton University

School of Engineering & Applied Science

Building a silicon quantum computer one atom at a time with scanning tunneling microscope lithography

Dr. Matthew House, University of New South Wales
Engineering Quadrangle, B205
Thursday, July 14, 2016 - 2:00pm

Spin states of individual phosphorus donor atoms in silicon have long quantum coherence times, which makes them very promising for storing and processing quantum information. In order to make a scalable quantum processor, we must be able to place individual phosphorus atoms in a silicon crystal, together with control and readout electrodes, with nanometer accuracy or better. In our research group at UNSW Australia we use scanning tunnelling microscope lithography to fabricate few-atom and single-atom devices in silicon. In my talk I will discuss recent progress we have been making towards multi-qubit devices, including independent readout of two electron spins and control of exchange interactions between them. I will also highlight rf measurement techniques we have been developing in order to reduce the size and complexity of readout structures in future multi-qubit devices.