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In classical computing, a bit (binary digit) has two dimensions by definition. Quantum computers employ qubits, the classical bit’s quantum equivalent, but could also use qudits, quantum systems with d potential states or dimensions. Markus Rambach of the University of Queensland in Australia and colleagues have now brought such an approach a step closer to reality by showing that a particular technique for measuring quantum states works for higher-dimensional systems than previously tested [1].

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