Quantum theory says that a measurement on a quantum system modifies, in general, its state. An ideal, projective measurement brings the system into one of the observable’s eigenstates. Such a “strong” measurement (SM) often consists of a series of “weak” ones (WM), each introducing smaller changes to the state until its complete projection. The speed at which the system is projected depends on the choice of the WM settings. We have realized an experiment demonstrating a significant speed-up of the overall projection time, by adapting the next WM setting to the actual knowledge on the system accumulated from the previous WMs.

© 2013 IEEE

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