What makes matter stable? Why are atoms as they are? Why do different materials vary in their properties, such as electrical conductivity, density, melting temperature or light-absorption spectra? Such questions exercised physicists greatly in the decades
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Microsoft unveiled its ‘Majorana 1’ quantum chip in February.Credit: John Brecher for Microsoft A physicist has cast doubt on a test that underlies a high-profile claim by Microsoft to have created the first ‘topological qubits’, a
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