Quantum Resources & Integration

Quantum Information Theory

Quantum Information is a broad field that includes both quantum communication and computation. This Theory Program includes also the theory of quantum resources (e.g. entanglement), quantum-limited measurement, and measurement-based quantum control. This Program is based squarely within Work Package 4, Quantum Resources and Integration. It will address both broad aspects of that Work Package. The first is to provide underpinning theory for the goals and ultimate integration of the quantum communication and quantum computation Work Packages. The second is to identify and pursue scientific applications arising from the ideas and technologies developed in the Centre.

Quantum Device Theory & Applications

The Quantum Device Theory and Applications Program will span theoretical descriptions of quantum devices and support of the relevant experiments as well as the development of near term applications using quantum technology based on optical and solid-state systems. In collaboration with the other theory programs simulations of solid-state electron qubit devices will provide interpretive guidance to the experimental programs. For the longer term quantum computing goals the program will investigate scale-up aspects of implementing quantum information processing in solid-state and optical systems. The program will also develop near term applications of quantum technology such as quantum sensing using spin qubits.

Solid State Optical Interface

Light is the ideal means of transmitting quantum information, it is difficult though to store information in the form of light. In contrast solid–state systems hold great promise for storing quantum information but it is difficult to transmit this information. We aim to utilize these complementary characteristics by developing techniques to reversible transfer quantum information between optical and solid-state systems. These techniques will allow us to create devices essential for the development of quantum communication networks. A major goal of the program is to entangle the quantum state of two separate crystals and maintain this entanglement for times longer than a second.

Quantum Networks & Control

The Quantum Networks and Control program (QNC) of CQC2T aims to develop device-level and systems-level methods and tools to enhance and enable the engineering of quantum information systems featuring solid-state quantum memories and quantum optical communications channels. The research will involve detailed model development and control system design for quantum information devices and networks.

Atomistic Simulation

The Molecular Modelling Program at the University of Sydney uses advanced quantum chemistry models to describe and understand how molecules react with the silicon surface. We look specifically at processes that are relevant to the atomic-scale device fabrication technology developed in the Centre. Our calculations characterize the thermodynamics and kinetics of these processes, which in turn provide explanatory and predictive guidance to the experimental research programs. Building on previous successes in fully elucidating the phosphine chemistry that underpins bottom-up Si:P device fabrication, our current research objective is explore alternative dopant sources and placement strategies. A second research aim is to characterize the electronic structure of the low-dimensionally doped semiconductors fabricated in experiment.