# Quantum Information Science & Technology

The research interests of the program led by Professor Lloyd Hollenberg cover many areas of quantum information science and applications for new quantum technology, as listed below. Much of the work is carried out under the umbrella of the Australian research Council Centre of Excellence for Quantum Computer Technology (CQCT).

A full list of the groups publications can be found here.

### Quantum computer architectures and algorithms

Development of new ideas for large scale quantum computation using solid-state (e.g. donors in silicon) and/or optical systems (e.g. photonic entanglement module), incorporating quantum error correction, and determination of the error threshold.

### Condensed matter theory of solid-state quantum devices

Detailed condensed matter models underpinning the most advanced silicon-based quantum computer architectures developed within the CQCT (e.g. gated single donor devices, planar STM patterned devices), and NV diamond for quantum communication.

### Qubit probes in imaging

The use of a NV spin qubit probe as a nanoscale magnetometer and/or decoherence monitor may open up a new suite of imaging capabilities of particular interest to understanding sub-cellular processes at the atomic level.

### Quantum algorithms/circuits

Direct (classical) simulations of specific quantum algorithms (e.g. Shorâ€™s factoring, quantum chemistry, search, quantum game theory) under various levels of assumptions about physical resources.

### Quantum control

Quantum mechanics allows for remarkable and non-intuitive ways of controlling qubit(s) system(s). Robust pulsing which protects the qubit system against (possibly unknown) errors is of particular interest.

## Recent Research Highlights

### Quantum confinement

G. Lansbergen et al, Nature Physics 2008

In collaboration with a team of international researchers (S. Rogge Delft, G. Klimeck Purdue) using a combined experimental and theoretical approach a new type of hybrid molecule system in the solid-state was found. The discovery arose by collecting and analysing transport spectra of a single donor in the channel of a silicon FinFET, coupled with extensive mega-atom simulations.

### Quantum phase transitions of light

A. Greentree et al, Nature Physics 2006

The prediction of a quantum phase transition in an array of coupled atom-cavity systems. The phase transition observed was the analogue of a metal-insulator phase transition, and this is completely unprecedented in a photonic system of this kind. Potential applications of this work lie in the fields of quantum simulations, adiabatic quantum computation and topological quantum computation.

## Collaborations and Support

Our research partners are listed below.

Centre for Quantum Computer Technology (CQCT) | |
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Quantum Communications Victoria (QCV) |