The Quantum Optics and Quantum Information Theory Group (QOQI) in the Department of Physics at the University of Queensland investigates the use of quantum optical systems for quantum information applications and fundamentals.
People
- Group Leader - Tim Ralph
- Postdocs - Christian Weedbrook, Jay Olson, Casey Myers
- Students - Aggie Branczyk, Tony Downes, Alex Hayes, Patrick Leung, Jacques Pienaar, Nathan Walk
- Visitors - Yan-Xiao Gong
Programs
Optical Quantum ComputingThe Optical Quantum Computing Program lies within the Centre for Quantum Computer Technology and is funded by the Australian Research Council, the University of Queensland, the US Disruptive Technologies Office, DEST and the Queensland State Government. The program investigates various approaches to quantum computing in which the quantum states of optical modes form the qubits. The two major paradigms pursued are the single photon approach of Knill, Laflamme and Milburn, Nature 409, 46 (2001) and the coherent state approach of Ralph et al, Phys. Rev. A 68, 042319 (2003). Both of these schemes employ linear optical processing but enhancement via non-linear techniques is also being explored. Our main collaborators within the Centre are the experimental programs at UQ, GU and UNSW@ADFA. We are members of the Optical Quantum Computation Concept Maturation Project in collaboration with the University of Illinois, the University of Maryland, Louisiana State University and the University of Vienna, University of Toronto and Imperial College.Continuous Variable Quantum InformationTraditionally quantum information research has concentrated on discrete variables such as spin with two dimensional Hilbert spaces. Recently there has been much interest in quantum information over continuous variables, infinite dimensional systems. This program investigates continuous variable generalizations of quantum teleportation, key distribution, cloning and even cluster state protocols. We collaborate closely with the Quantum Optics Group at the Australian National University as well as the Max-Planck-Forschungsgruppe für Optik, Information und Photonik in Erlangen Germany and QiSci at UQ. Funding sources are the Australian Research Council and the Defence Science and Technology Organization.Relativistic Quantum InformationUntil recently most quantum information research has been formulated in a non-relativistic setting. The desire for a better understanding of the interaction between quantum mechanics and relativity, plus the ever increasing sensitivity of experiments has stimulated research into relativistic quantum information. Currently we are interested in quantum information protocols and entanglement in curved space-time. We collaborate closely with Prof. Gerard Milburn’s group at UQ. Funding is through the Defence Science and Technology Organization.