Multimode optical parametric amplification in the phase-sensitive regime

• URL: http://arxiv.org/abs/2102.11659v1
• Date: Tue, 23 Feb 2021 12:26:07 GMT
• Title: Multimode optical parametric amplification in the phase-sensitive regime
• Authors: Gaetano Frascella, Roman V. Zakharov, Olga V. Tikhonova, and Maria V. Chekhova
• Abstract summary: We find the optimal methods for multimode phase-sensitive amplification. Phase-sensitive amplification is obtained by tightly focusing the seed into the crystal. This suggests that phase-sensitive amplification of sub-shot-noise images should be performed in the near field.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Phase-sensitive optical parametric amplification of squeezed states helps to overcome detection loss and noise and thus increase the robustness of sub-shot-noise sensing. Because such techniques, e.g., imaging and spectroscopy, operate with multimode light, multimode amplification is required. Here we find the optimal methods for multimode phase-sensitive amplification and verify them in an experiment where a pumped second-order nonlinear crystal is seeded with a Gaussian coherent beam. Phase-sensitive amplification is obtained by tightly focusing the seed into the crystal, rather than seeding with close-to-plane waves. This suggests that phase-sensitive amplification of sub-shot-noise images should be performed in the near field. Similar recipe can be formulated for the time and frequency, which makes this work relevant for quantum-enhanced spectroscopy.

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