Quantum communication has the potential to provide complete security against eavesdropping in communication networks through the use of quantum key distribution (QKD). Beyond QKD a quantum communication network will enable the distribution of quantum entanglement for distributed quantum processing and for quantum sensing.

CQC²T is developing the underlying quantum technologies and protocols to enable secure communication over large distances (>100 km) and for efficient routing of quantum information through the networks.

Our aim is to extend quantum optical technology to enable the transmission, storage, processing and detection of quantum information in an effort to realise long distance quantum communication to facilitate quantum encryption and distributed quantum computing.

Our approaches are to explore space-based quantum links and quantum repeater networks.

Platform Leaders

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Publications

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Quantum repeater for continuous-variable entanglement distribution J Dias, MS Winnel, N Hosseinidehaj, TC Ralph Physical Review A, 102, 052425 (2020)
A high-fidelity heralded quantum squeezing gate J Zhao, K Liu, H Jeng, M Gu, J Thompson, PK Lam, SM Assad Nature Photonics, 14, 306 (2020)
Radiation tolerance of two-dimensional material-based devices for space applications T Vogl, K Sripathy, A Sharma, P Reddy, J Sullivan, JR Machacek, L Zhang, F Karouta, BC Buchler, MW Doherty, Y Lu, PK Lam
Nature Communications, 10, 1202 (2019)
Quantum error correction of continuous-variable states with realistic resources Josephine Dias and T. C. Ralph Phys. Rev. A, 97, 032335 (2018)
Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states JY Haw, J Zhao, J Dias, SM Assad, M Bradshaw, R Blandino, T Symul, TC Ralph and PK Lam Nature Communications, 7, 13222 (2016)
Measurement-based noiseless linear amplification for quantum communication H.M. Chrzanowski, N. Walk, S.M. Assad, J. Janousek, S. Hosseini, T.C. Ralph, T. Symul and P.K. Lam Nature Photonics, 8, 333 (2014)
Entanglement properties of a measurement-based entanglement distillation experiment H Jeng, S Tserkis, JY Haw, HM Chrzanowski, J Janousek, TC Ralph, PK Lam, SM Assad Physical Review A, 99, 042304 (2019)
Heralded noiseless linear amplification and distillation of entanglement G.Y. Xiang, T.C. Ralph, A.P. Lund, N. Walk and G.J. Pryde Nature Photonics, 4, 316 (2010)
Heralded noiseless amplification of a photon polarization qubit S. Kocsis, G.Y. Xiang, T.C. Ralph and G.J. Pryde Nature Physics, 9, 23 (2013)
Integrated photonic platform for quantum information with continuous variables F Lenzini, J Janousek, O Thearle, M Villa, B Haylock, S Kasture, L Cui, H Phan, D Viet, H Yonezawa, PK Lam, EH Huntington, M Lobino Science Advances, 4, eaat9331 (2018)

video

Quantum Cloning

September 20, 2021

Theoretical tutorial: Quantum communications by Prof Tim Ralph

September 20, 2021