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Broadening the high sensitivity range of squeezing-assisted interferometers by means of two-channel detection

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Frascella,  Gaetano
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg, Erlangen, Germany;

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Chekhova,  Maria V.
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg, Erlangen, Germany;

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oe-29-1-95.pdf
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Citation

Shukla, G., Salykina, D., Frascella, G., Kumar Mishra, D., Chekhova, M. V., & Khalili, F. (2020). Broadening the high sensitivity range of squeezing-assisted interferometers by means of two-channel detection. Optics Express, 29(1): 413391. doi:10.1364/OE.413391.


Cite as: http://hdl.handle.net/21.11116/0000-0007-DC89-7
Abstract
For a squeezing-enhanced linear (so-called SU(2)) interferometer, we theoretically investigate the possibility to broaden the phase range of sub-shot-noise sensitivity. We show that this goal can be achieved by implementing detection in both output ports, with the optimal combination of the detectors outputs. With this modification, the interferometer has the phase sensitivity independent of the interferometer operation point and, similar to the standard dark port regime, is not affected by the laser technical (excess) noise. Provided that each detector is preceded by a phase-sensitive amplifier, this sensitivity could be also tolerant to the detection loss.