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Quantum physics

Cruise control for a qubit

Continuous feedback control — monitoring a system and adjusting its dynamics — is widely used to keep systems 'on track'. This approach has now been used to maintain the cycling of a quantum bit almost indefinitely. See Letter p.77

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Figure 1: Locking cycles to an external clock.

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Correspondence to Howard M. Wiseman.

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Wiseman, H. Cruise control for a qubit. Nature 490, 43–44 (2012). https://doi.org/10.1038/490043a

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