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Researchers at the University of the Witwatersrand (Wits) demonstrated an 11-dimensional quantum state and used it to share sensitive information securely from one sender to 10 parties. They used structured light to achieve a high-dimensional quantum state and then engineered a protocol to ensure information sharing was only among secure and trusted parties.
To push the dimension limit, the team used the high-dimensional Hilbert space for orbital angular momentum and used perfect vortex beams as carriers. The dimension of the quantum state has an impact on how large a secret can be.
An artistic impression depicting quantum secret sharing using structured light. Courtesy of Wits University.
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