Greig Cowan and Tim Gershon describe recent discoveries of new types of matter called tetraquarks and pentaquarks, and discuss the outlook for understanding these particles.

Quantum computers are capable of solving certain problems whose scale lies outside that of classical computers. For some of these problems not even the solution can be efficiently checked with a classical computer. While schemes can verify an arbitrary quantum computation with a limited set of quantum operations, the minimum quantum resources to perform such a verification is an open question. Samuele, Theodoros, and Animesh from the quantum information group have published a paper on verification in Physical Review A (DOI: https://doi.org/10.1103/PhysRevA.98.022323) demonstrating an improvement on the existing requirements for schemes to verify quantum computations. In this work the authors demonstrate a verification scheme which works with a further reduced number of such quantum operations.

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