Abstract

The evolution of a quantum system is impeded by the system’s statebeing observed. A test on an ensemble neither proves the causal nexus nordiscloses the nature of the inhibition. Two recent experiments that makeuse of sequential optical or microwave-optical double resonance on anindividual trapped ion disprove a dynamical effect of back action by meter orenvironment. They rather indicate the ionic states involved in the evolution beingentangled with the potentially recorded bivalued scattered-light signal.

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