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Journal Article

Wide-field SU(1,1) interferometer

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Frascella,  Gaetano
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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

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Citation

Frascella, G., Mikhailov, E. E., Takanashi, N., Zakharov, R. V., Tikhonova, O. V., & Chekhova, M. (2019). Wide-field SU(1,1) interferometer. Optica, 6(9), 1233-1236. doi:10.1364/OPTICA.6.001233.


Cite as: https://hdl.handle.net/21.11116/0000-0005-0C9C-F
Abstract
An SU(1,1) interferometer uses a sequence of two optical parametric amplifiers for achieving sub-shot-noise sensitivity to a phase shift introduced in between. We present the first realization of a wide-field SU(1,1) interferometer, where the use of a focusing element enables spatially multimode operation within a broad angle. Over this angle, the interference phase is found to be flat. This property is important for the high sensitivity to the phase front disturbance. Further, -4.3 +/- 0.7 dB quadrature squeezing, an essential requirement to the high sensitivity, is experimentally demonstrated for plane-wave modes inside the interferometer. Such an interferometer is useful not only for quantum metrology, but also in remote sensing, enhanced sub-shot-noise imaging, and quantum information processing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement