A study has been made on how continuous measurement affects the behavior of a two-level quantum system whose free evolution is characterized by oscillations between levels. As the measurement accuracy increases, the oscillation frequency decreases, and at a certain accuracy, the oscillations are replaced by aperiodic transition to the equilibrium state. The transition time-constant increases with the accuracy. If the system is tracked with absolute accuracy, it is frozen in the initial level.
Molecular Physics and Physical Measurement Department
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