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It is expected that full scale quantum computers will be able to perform certain tasks exponentially faster than traditional computers, but there is a large class of quantum operations, called stabiliser circuits, that can be simulated efficiently by a conventional computer. So-called near-stabiliser circuits include modest amounts of a quantum resource known as 'magic' in the literature, which is crucial in giving quantum computers an edge over their classical counterparts.

James Seddon together with collaborator Earl Campbell based at the University of Sheffield succeed, in their recent paper published in Proceedings of the Royal Society A, to rigorously quantify this resource, and present more efficient methods to simulate certain types of noisy operation relevant to ongoing experimental work in quantum technologies.

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IMAGE CAPTION: Cartoon illustrating the correspondence between channel and state decompositions. Credit: James Seddon, °×С½ãÂÛ̳Q.

MEDIA CONTACT: Agnese Abrusci, °×С½ãÂÛ̳ Quantum Science and Technology Institute