Alexander Ling Group

Our group is working to bring optical quantum technology out of the lab and into the field – and even into orbit. Such field-tests of quantum mechanics pave the way for developing applications of quantum physics.

One of our team's major goals is the development of complete entangled photon experiments that are palm-sized and suitably ruggedized for use on small satellites (CubeSats or larger), and other low-resource mobile platforms. This compares to typical lab-based entanglement experiments which run in a protected environment without severe space or power constraints.

For the satellite instrument development, we tie many different branches of physics together. Our work involves a lot of system design and integration, low-power radiation-tolerant electronics and elegant opto-mechanical design. For example, proton-induced displacement damage is a major concern, and team members have been both studying radiation models in space and conducting tests on devices to understand the impact of radiation on the lifetime of our experiments.

We have also pioneered the testing of quantum systems at the edge of space using high-altitude balloons. In one recent test, instruments were carried to an altitude of 37km and successfully recovered. The test data reveal that the control systems worked flawlessly and we are looking forward to more advanced field tests.

Looking to the future, we anticipate that integrated photonics will play a large role in the miniaturisation of quantum systems. Our team also has an effort aimed at studying waveguide structures as sources of quantum entanglement, as well as studying how complete experiments may be fabricated on a single chip.

Undergraduates are encouraged to join our team for exposure to cutting-edge experimental optics.

More information at our homepage:

Group Members

Recent papers

  • J. Grieve, K. F. Ng, Manuel J. L. F. Rodrigues, José Viana-Gomes, A. Ling. (2017). Mechanically tunable integrated beamsplitters on a flexible polymer platform. Applied Physics Letters 111 211106
  • Y. Shi, Z. J. Lim, H.S. Poh, P.K. Tan, Peiyu Amelia Tan, A. Ling, C. Kurtsiefer. (2017). Breakdown flash at telecom wavelengths in InGaAs avalanche photodiodes. Optics Express 25 30388
  • Chandrasekara C.M.R.B., Chandrasekara C.M.R.B., Kadir Durak, A. Ling. (2017). Tracking capacitance of liquid crystal devices to improve polarization rotation accuracy. Optics Express 25 20363
  • R. Bedington, J.M. Arrazola, A. Ling. (2017). Progress in satellite quantum key distribution. NPJ: Quantum Information 3 30
  • Daniel KL Oi, A. Ling, Giuseppe Vallone, Paolo Villoresi, Steve Greenland, Emma Kerr, Malcolm Macdonald, Harald Weinfurter, Hans Kuiper, Edoardo Charbon, Rupert Ursin. (2017). CubeSat quantum communications mission. EPJ Quantum Technology 4 6
  • Daniel Oi, A. Ling, J. Grieve, Thomas Jennewein, Aline Dinekelaker, Markus Krutzik. (2016). Nanosatellites for quantum science and technology. Contemporary Physics 58 25-52
  • R. Bedington, B.Xueliang, T.C.Edward, Y.C. Tan, K. Durak, A.V.Zafra, J. Grieve, Daniel Oi, A. Ling. (2016). Nanosatellite experiments to enable future space-based QKD missions. EPJ Quantum Technology 3 12
more publications >

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