Abstract
Uncontrollable outside influences undermine the whole enterprise of quantum computing. Nailing down the sources of this 'decoherence' in a solid-state system is a step towards solving the problem. Molecular magnets are a type of molecule containing multiple magnetic ions whose spins are tightly coupled to give a single 'collective' spin. The quantum mechanical properties of this collective spin are attracting attention as a possible basis for the functional unit of a quantum computer. Until now it has not been clear whether the quantum spin states of these molecular entities are sufficiently long-lived to permit useful computation, but new work suggests that they are. Bertaina et al. observed pronounced quantum oscillations between the spin states of one such molecular magnet, consistent with long-lived quantum coherence, in this system at least. They also outline a scheme by which, through careful material design, these properties could be harnessed in a practical context.
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