Researchers have demonstrated that a single molecule can switch a light beam on or off, a function that could be useful for controlling elements of a quantum computer or a network of such computers [1]. In demonstrating the switching, the team observed a quantum effect called vacuum Rabi splitting, which has not previously been observed in single molecules. The system used by the team, which consists of a molecule coupled to an optical cavity, could also act as a quantum bit, or qubit, adding to the list of qubit candidates.
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