Quantum optics provides a promising pathway to quantum computing at scale, with low-noise operations, the ability to muster large numbers of addressable quantum systems, and a history of demonstrating quantum processing firsts.

As we reach towards universal quantum computing, it is critically important to develop new protocols, technologies and intermediate-scale logic to demonstrate quantum advantage and construct a real test-bed to advance the science behind future technology.

In CQC²T, Quantum Optical Protocols range from theoretical schemes for realising algorithms and error correction, through to efficient and practical optical encodings, and onto underlying source, circuit and detection technologies.

These work alongside our Integrated Quantum Optics platform technology for compact and robust scaling. Protocols and technologies for optical quantum computing also directly support distributed and networked communications and processing, where optics is critical.

Platform Leaders

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Featured Publications

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A strong no-go theorem on the Wigner’s friend paradox KW Bong, A Utreras-Alarcón, F Ghafari, YC Liang, N Tischler, EG Cavalcanti, GJ Pryde, HM Wiseman Nature Physics, https://doi.org/10.1038/s41567-020-0990-x (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)
An experimental quantum Bernoulli factory RB Patel, T Rudolph, GJ Pryde

Science Advances, 5, eaau6668 (2019)
Multiparameter optimisation of a magneto-optical trap using deep learning A. D. Tranter, H. J. Slatyer, M. R. Hush, A. C. Leung, J. L. Everett, K. V. Paul, P. Vernaz-Gris, P. K. Lam, B. C. Buchler & G. T. Campbell Nature Communications, 9, 4360 (2018)
Conclusive experimental demonstration of one-way Einstein-Podolsky-Rosen steering N Tischler, F Ghafari, TJ Baker, S Slussarenko, RB Patel, MM Weston, S Wollmann, LK Shalm, VB Verma, SW Nam, HC Nguyen, HM Wiseman, GJ Pryde Physical Review Letters, 121, 100401 (2018)
Experimentally modeling stochastic processes with less memory by the use of a quantum processor MS Palsson, M Gu, J Ho, HM Wiseman and GJ Pryde Science Advances, 3, e1601302 (2017)
Efficient and pure femtosecond-pulse-length source of polarization-entangled photons MM Weston, HM Chrzanowski, S Wollmann, A Boston, J Ho, LK Shalm, VB Verma, MS Allman, SW Nam, RB Patel, S Slussarenko and GJ Pryde Optics Express, 24, 10869 (2016)
All-Gaussian Universality and Fault Tolerance with the Gottesman-Kitaev-Preskill Code BQ Baragiola, G Pantaleoni, RN Alexander, A Karanjai, NC Menicucci Physical Review Letters, 123, 200502 (2019)
Photonic quantum information processing: A concise review S Slussarenko, GJ Pryde Applied Physics Reviews, 6, 041303 (2019)
Generation of time-domain-multiplexed two-dimensional cluster state W Asavanant, Y Shiozawa, S Yokoyama, B Charoensombutamon, H Emura, RN Alexander, S Takeda, J Yoshikawa, NC Menicucci, H Yonezawa, A Furusawa Science, 366, 373 (2019)
Ultra-large-scale continuous-variable cluster states multiplexed in the time domain S. Yokoyama, R. Ukai, S.C. Armstrong, C. Sornphiphatphong, T. Kaji, S. Suzuki, J. Yoshikawa, H. Yonezawa, N.C. Menicucci and A. Furusawa Nature Photonics, 7, 982 (2013)
Boson sampling from a gaussian state A.P. Lund, A. Laing, S. Rahimi-Keshari, T. Rudolph, J.L. O’Brien, and T.C. Ralph Physical Review Letters, 113, 100502 (2014)
Photonic boson sampling in a tunable circuit M.A. Broome, A. Fedrizzi, S. Rahimi-Keshari, J. Dove, S. Aaronson, T.C. Ralph and A.G. White Science, 339, 794 (2013)
A quantum Fredkin gate RB Patel, J Ho, F Ferreyrol, TC Ralph and GJ Pryde Science Advances, 2, e1501531 (2016)
Towards quantum chemistry on a quantum computer B.P. Lanyon, J.D. Whitfield, G.G. Gillett, M.E. Goggin, M.P. Almeida, I. Kassal, J.D. Biamonte, M. Mohseni, B.J. Powell, M. Barbieri, A. Aspuru-Guzik and A.G. White Nature Chemistry, 2, 106 (2010)
Universal Quantum Computation with Continuous-Variable Cluster States Nicolas C. Menicucci, Peter van Loock, Mile Gu, Christian Weedbrook, Timothy C. Ralph, and Michael A. Nielsen Phys. Rev. Lett., 97, 110501 (2006)
Demonstration of an all-optical quantum controlled-NOT gate J. L. O'Brien, G. J. Pryde, A. G. White, T. C. Ralph & D. Branning Nature, 426, 264 (2003)
A scheme for efficient quantum computation with linear optics E. Knill, R. Laflamme and G.J. Milburn Nature, 409, 46 (2001)