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Quantum theorists from Griffith University and Macquarie University, both in Australia, used quantum mechanics to overturn an assertion about laser coherence that has been the common belief for 60 years. The research shows that it is possible to build a quantum-limited laser using superconducting technology, which is currently used in quantum computing.
Laser coherence refers to the number of photons emitted consecutively into a beam with the same phase, and determines how well it can perform a variety of precision tasks, such as controlling components of a quantum computer.
Artist’s conception of a superconducting device which could realize a laser operating at the ultimate quantum limit. Courtesy of Ludmila Odintsova/Griffith…