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.
Quantum Optical Metrology -- The Lowdown on High-N00N States
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abstract
Quantum states of light, such as squeezed states or entangled states, can be used to make measurements (metrology), produce images, and sense objects with a precision that far exceeds what is possible classically, and also exceeds what was once thought to be possible quantum mechanically. The primary idea is to exploit quantum effects to beat the shot-noise limit in metrology and the Rayleigh diffraction limit in imaging and sensing. Quantum optical metrology has received a boost in recent years with an influx of ideas from the rapidly evolving field of optical quantum information processing. Both areas of research exploit the creation and manipulation of quantum-entangled states of light. We will review some of the recent theoretical and experimental advances in this exciting new field of quantum optical metrology, focusing on examples that exploit a particular two-mode entangled photon state -- the High-N00N state.
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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.