Interaction-free interferometry carries half the Fisher information of direct probing for transmissivity, equal information per absorbed photon, and only beats direct schemes when distinguishing an object from empty space, at a rate growing like the number of Zeno cycles.
In anN-cycle chain the conclusive outcome still carries posterior unity, while the absorbed fraction falls asπ 2/4N
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Counterfactual Quantum Sensing: What Interaction-Free Measurement Can and Cannot Buy
Interaction-free interferometry carries half the Fisher information of direct probing for transmissivity, equal information per absorbed photon, and only beats direct schemes when distinguishing an object from empty space, at a rate growing like the number of Zeno cycles.