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Detection Loss Tolerant Supersensitive Phase Measurement with an SU(1,1) Interferometer

MPS-Authors
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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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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201034

Chekhova,  Maria
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;
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., Leuchs, G., Khalili, F., & Chekhova, M. (2017). Detection Loss Tolerant Supersensitive Phase Measurement with an SU(1,1) Interferometer. PHYSICAL REVIEW LETTERS, 119(22): 223604. doi:10.1103/PhysRevLett.119.223604.


Cite as: https://hdl.handle.net/21.11116/0000-0000-8009-5
Abstract
In an unseeded SU(1,1) interferometer composed of two cascaded degenerate parametric amplifiers, with direct detection at the output, we demonstrate a phase sensitivity overcoming the shot noise limit by 2.3 dB. The interferometer is strongly unbalanced, with the parametric gain of the second amplifier exceeding the gain of the first one by a factor of 2, which makes the scheme extremely tolerant to detection losses. We show that by increasing the gain of the second amplifier, the phase supersensitivity of the interferometer can be preserved even with detection losses as high as 80%. This finding can considerably improve the state-of-the-art interferometry, enable sub-shot-noise phase sensitivity in spectral ranges with inefficient detection, and allow extension to quantum imaging.