Author: Andrew See

Professor Andrew Dzurak’s team has had new results opening the path to a quantum data bus for silicon CMOS quantum processor chips published in Nature Communications yesterday. These show that electron spin qubits can be transported between quantum dots while maintaining their spin polarisation (to 99.97%) and spin coherence (to 99.4%) information. The experiments were performed by former postdoc Jun Yoneda and former PhD student Wister Huang, crucial theory was supported by Andre Saraiva and his PhD student Mengke Feng, and all devices were all fabricated at ANFF-NSW.

UNSW researcher Dr Udo Römer has been granted an ARC Discovery Early Career Researcher Award for the project “Nervous tissue stimulation using multi-junction silicon photodiodes”. He will use the ANFF-NSF facilities for thin film depositions and microfabrication of devices.

Professor Andrew Dzurak’s team has had their work on CMOS qubits recognised with a recent paper acceptance in Nature Communications.

The paper reports an experimental demonstration of a new type of two-qubit logic gate based on our SiMOS qubit technology which allows more complex multi-electron spin systems to act as qubits.

The technological implications of this work are quite significant, since previous demonstrations have largely relied on qubits based on single electron wavefunctions, which can be easily distorted in a real CMOS device.  By moving to qubits containing more electrons the devices become more robust, and therefore more easily constructed using CMOS manufacturing.

The experiments were performed by our recently graduated PhD student, Ross Leon.  Ross was supported in his experiments by Dr Henry Yang, and the detailed theoretical analysis behind this work was led by Dr Andre Saraiva.

All of the qubit devices used for this study were fabricated entirely at our ANFF-NSW facility at UNSW.

Announced today by Professor Nicholas Fisk – Deputy Vice-Chancellor, Research & Enterprise, UNSW. Scientia Professor Sven Rogge has been appointed to the position of Pro Vice-Chancellor Research (PVCR) at UNSW Sydney for a period of 12 months from 1 March 2021.