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

  • Angelina Frank, Daniel Leykam, Daria A. Smirnova, D.G. Angelakis, A. Ling. Boosting Topological Zero Modes Using Elastomer Waveguide Arrays.
  • S. Sachidananda, A. Ling, Leonid Krivitsky, Victor Leong, Prithvi Gundlapalli, S. Sachidananda. Realizing a robust, reconfigurable active quenching design for multiple architectures of single-photon avalanche detectors.
  • A. Ling, Thomas Jennewein, Daniel K. L. Oi, Tom Vergoossen, Thomas Brougham, Brendon L. Higgins, Jasminder S. Sidhu, Tanvirul Islam. Finite resource performance of small satellite-based quantum key distribution missions.
  • A.B.Frank, Justin Zhou, J. Grieve, Ivan Verzhbitskiy, José Viana-Gomes, Leyi Loh, Michael Schmid, Kenji Watanabe, Takashi Taniguchi, Goki Eda, A. Ling. Mode-center Placement of Monolayer WS$_{2}$ in a Photonic Polymer Waveguide.
  • A. Ling, Douglas Griffin, Jai Vennik, Simon Barraclough, Nguyen Hong Nhung, Alexander Lohrmann, Aitor Villar, Xueliang Bai, Robert Bedington, Tom Vergoossen, Huai Ying Lim. Thermo-mechanical design for a miniaturized quantum light source on board the SpooQy-1 CubeSat.
  • Chithrabahnu Perumangatt, Tom Vergoossen , Alexander Lohrmann, Srihari Sivankaran, Ayesha Reezwana, Ali Anwar, S. Sachidananda, S. Sachidananda, Tanvirul Islam, A. Ling. (2021). Realizing quantum nodes in space for cost-effective, global quantum communication: in-orbit results and next steps. Proc. Of SPIE 11699 1169904
  • Markus Krutzik, A. Ling, Andreas Wicht, Benjamin Wiegand, Max Schiemangk, Simon Kanthak, Aaron Strangfeld. (2021). Prototype of a compact rubidium-based optical frequency reference for operation on nanosatellites. J. Opt. Soc. Am. B 38 1885
more preprints > more publications >

We are hiring


Find out more about our PhD Positions on the Join us page.

go to Join Us >