A remarkable variety of technologies are based on light, from the barcode scanners in your local supermarket to the sprawling web of undersea cables supporting the global internet. Yet there are more surprises which await, for the quantum nature of light leads to new forms of technology that would not otherwise be possible. In this seminar, I will explain the basic principles behind quantum communication and quantum computation with light: How does it work? And what purpose would it serve? I will use some of our recent experiments to illustrate key elements of these technologies. These experiments demonstrate the suppression of decoherence, which is necessary for overcoming transmission loss and noise in the quantum internet, and the production of unitaries with cubic Hamiltonians, which is an essential component for a certain type of universal quantum computer.

Hao Jeng completed his PhD under the supervision of Dr. Syed M. Assad (DQST, ANU). He is currently working as a postdoctoral fellow in the ARC Centre of Excellence for Quantum Computation and Communication Technology. His research specialisation is experimental quantum optics.

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