Quantum Communication is the transmission of information via the coherent exchange of quantum systems, usually optical. Its study has led to new communication technologies, for example quantum key distribution, a secure communication technique with no classical analogue.

The Quantum Communication Theory Program, led by Professor Tim Ralph from the University of Queensland, studies a broad range of issues associated with quantum communication and fundamental aspects of quantum information and metrology.

We are particularly concerned with the scaling up of short to long range communication through the development of quantum repeaters and related technology. We collaborate with several groups on demonstrating key technologies.


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Multimode metrology via scattershot sampling JJ Guanzon, AP Lund, TC Ralph Physical Review A, 104, 032607 (2021)
Thermality, causality, and the quantum-controlled Unruh-deWitt detector J Foo, S Onoe, RB Mann, M Zych Physical Review Research, 3, 043056 (2021)
Minimization of information leakage in continuous-variable quantum key distribution MS Winnel, N Hosseinidehaj, TC Ralph Physical Review A, 104, 012411 (2021)
Schrodinger’s cat for de Sitter spacetime J Foo, RB Mann, M Zych Classical and Quantum Gravity, 38, 115010 (2021)
Time-traveling billiard-ball clocks: A quantum model LG Bishop, F Costa, TC Ralph Physical Review A, 103, 042223 (2021)