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Journal Article

Phase sensitivity of gain-unbalanced nonlinear interferometers

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Manceau,  Mathieu
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Giese, E., Lemieux, S., Manceau, M., Fickler, R., & Boyd, R. W. (2017). Phase sensitivity of gain-unbalanced nonlinear interferometers. PHYSICAL REVIEW A, 96(5): 053863. doi:10.1103/PhysRevA.96.053863.


Cite as: https://hdl.handle.net/21.11116/0000-0000-8005-9
Abstract
The phase uncertainty of an unseeded nonlinear interferometer, where the output of one nonlinear crystal is transmitted to the input of a second crystal that analyzes it, is commonly said to be below the shot-noise level but highly dependent on detection and internal loss. Unbalancing the gains of the first (source) and second (analyzer) crystals leads to a configuration that is tolerant against detection loss. However, in terms of sensitivity, there is no advantage in choosing a stronger analyzer over a stronger source, and hence the comparison to a shot-noise level is not straightforward. Internal loss breaks this symmetry and shows that it is crucial whether the source or analyzer is dominating. Based on these results, claiming a Heisenberg scaling of the sensitivity is more subtle than in a balanced setup.