Friday, 10 June 2016
World-first pinpointing of atoms at work for quantum computers
It's now possible to track and see individual phosphorus atoms in a silicon crystal allowing confirmation of quantum computing capability, but which also has use in nano detection devices. Quantum computing has the potential for enormous processing power in the future. Current laptops have transistors that use a binary code, an on-or-off state (bits). But tomorrow's quantum computers will use quantum bits 'qubits', which havemultiple states. Professor Lloyd Hollenberg at the University of Melbourne and Deputy Director of the Centre for Quantum Computation and Communication Technology led an international investigation on the fundamental building blocks of silicon based solid-state quantum processors. His collaborators Professor Sven Rogge and Centre Director Professor Michelle Simmons at the University of New South Wales, obtained atomic-resolution images from a scanning tunneling microscope (STM) allowing the team to precisely pinpoint the location of atoms in the silicon crystal lattice. 'The atomic microscope images are remarkable and sensitive enough to show the tendrils of an electron wave function protruding from the silicon surface. The theory is now visible, this is a world first,' said Professor Hollenberg. Lead author of the paper recently published in Nature Nanotechnology, Dr Muhammad Usman from the University of Melbourne said: 'The images showed a dazzling array of symmetries that seemed to defy explanation, but when the quantum state environment is taken into account, suddenly the images made perfect sense.'
The teams from University of Melbourne, UNSW and Purdue University USA are part of the world-leading research at the Centre focused on the demonstration of the fundamental building blocks of a silicon-based solid-state quantum processor.
In 2015, the Centre for Quantum Computation and Communication Technology was included in the Prime Minister's Innovation and Science Agenda -- a significant undertaking by the Federal Government also supported by a combined $20m investment commitment from Telstra and the Commonwealth Bank.
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