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By 1935 the conceptual understanding of the quantum theory was dominated by Bohr's ideas concerning complementarity. Those ideas centered on observation and measurement in the quantum domain. According to Bohr's views at that time, observing a quantum object involves a physical interaction with a classical measuring device that results in an uncontrollable disturbance of both systems. The picture here is of a tiny object banging into a big apparatus. The disturbance this produces on the measuring instrument is what issues in the measurement "result" which, because it is uncontrollable, can only be predicted statistically. The disturbance experienced by the quantum object restricts those quantities that can be co-measured with precision. According to complementarity when we observe the position of an object, we disturb its momentum uncontrollably. Thus we cannot determine precisely both position and momentum. A similar situation arises for the simultaneous determination of energy and time. Thus complementarity involves a doctrine of uncontrollable physical disturbance that, according to Bohr, underwrites the Heisenberg uncertainty relations and is also the source of the statistical character of the quantum theory. (See Copenhagen Interpretation and Uncertainty Principle.)
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