The description of interaction-free measurements given in Section 6.4 assumed that the beam splitters involved are 50:50. The presence of an object in one arm is determined when one of the detectors, the one initially not firing because of interference, with no object in one of the arms, begins to fire. It will fire in one-fourth of the runs. Examine he question: can the presence of an object in one arm be detected more efficiently (i.e. in a greater number of experimental runs) by using beam splitters that are not 50:50?
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