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Quantum states that are entangled in many dimensions are key to our emerging quantum technologies, where more dimensions mean a higher quantum bandwidth (faster) and better resilience to noise (security), crucial for both fast and secure communication and speed up in error-free quantum computing. Now researchers at the University of the Witwatersrand in Johannesburg, South Africa, together with collaborators from Scotland, have invented a new approach to probing these "high-dimensional" quantum states, reducing the measurement time from decades to minutes.

The study was published in the scientific journal, Nature Communications, on Friday, 27 August 2021. Wits PhD student Isaac Nape worked with Distinguished Professor Andrew Forbes, lead investigator on this study and Director of the Structured Light Laboratory in the School of Physics at Wits University, as well as postdoctoral fellow Dr Valeria Rodriguez-Fajardo, visiting Taiwanese researcher Dr Hasiao-Chih Huang, and Dr Jonathan Leach and Dr Feng Zhu from Heriot-Watt University in Scotland.

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