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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Universal quantum computation with optical four-component cat qubits DQ Su, I Dhand, TC Ralph Physical Review A, 106, 042614 (2022)
Berry Phase from the Entanglement of Future and Past Light Cones: Detecting the Timelike Unruh Effect JQ Quach, TC Ralph and WJ Munro Physical Review Letters, 129, 160401 (2022)
Entanglement based tomography to probe new macroscopic forces RJ Marshman, S Bose, PF Barker, A Mazumdar Physical Review D, 106, L041901 (2022)
Billiard-ball paradox for a quantum wave packet Classical and Quantum Gravity, 39, 17 (2022)