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Improving the phase super-sensitivity of squeezing-assisted interferometers by squeeze factor unbalancing

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

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Chekhova,  Maria
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Manceau, M., Khalili, F., & Chekhova, M. (2017). Improving the phase super-sensitivity of squeezing-assisted interferometers by squeeze factor unbalancing. NEW JOURNAL OF PHYSICS, 19: 013014. doi:10.1088/1367-2630/aa53d1.


Cite as: https://hdl.handle.net/21.11116/0000-0000-78DB-3
Abstract
The sensitivity properties of an SU(1,1) interferometer made of two cascaded parametric amplifiers, as well as of an ordinary SU(2) interferometer preceded by a squeezer and followed by an anti-squeezer, are theoretically investigated. Several possible experimental configurations are considered, such as the absence or presence of a seed beam, direct or homodyne detection scheme. In all cases we formulate the optimal conditions to achieve phase super-sensitivity, meaning a sensitivity overcoming the shotnoise limit. Weshow that for a given gain of the first parametric amplifier, unbalancing the interferometer by increasing the gain of the second amplifier improves the interferometer properties. In particular, a broader super-sensitivity phase range and a better overall sensitivity can be achieved by gain unbalancing.