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: http://www.quantumlah.org/AlexLinggroup

Group Members

Recent papers

  • Tom Vergoossen, R. Bedington, James A Grieve, A. Ling. (2019). Satellite quantum communications when man-in-the-middle attacks are excluded. Entropy 21 387
  • F. Auksztol, Daniele Vella, Ivan Verzhbitskiy, K. F. Ng, Ho Yi Wei, J. Grieve, Jose Viana-Gomes, Goki Eda, A. Ling. (2019). Elastomeric waveguide on-chip coupling of an encapsulated MoS$_2$ monolayer. ACS Photonics
  • K.T. Goh, C. Perumangatt, Zhi Xian Lee, A. Ling, V. Scarani. (2019). Experimental comparison of tomography and self-testing in certifying entanglement. Phys. Rev. A 100 022305
  • Denis Naughton, R. Bedington, Simon Barraclough, T.Islam, Doug Griffin, Brenton Smith, Joe Kurtz, Andrey Alenin, Israel J. Vaughn, Arvind Ramana, Igor Dimitriyevic, Tang Zong Sheng, C. Kurtsiefer, A. Ling, Russell Boyce. (2019). Design considerations for an optical link supporting intersatellite quantum key distribution. Optical Engineering 58 016106
  • J. Grieve, Y. Shi, H.S. Poh, C. Kurtsiefer, A. Ling. (2019). Characterizing nonlocal dispersion compensation in deployed telecommunications fiber. Applied Physics Letters 114 131106
  • A. Ling, Tang Zong Sheng, C. Perumangatt. (2018). Experimental distillation of bi-partite polarization entanglement using polarizing Mach-Zehnder interferometers. Phys. Rev. A 98 022313
  • A. Lohrmann, A.V.Zafra, A. J. Stolk, Adriaan Johannes Stolk, A. Ling. (2018). Optimal spatial filtering for a bright entangled photon source. Applied Physics Letters 113 171109
more publications >

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