We present squeezed light that is robust against spatial mode mismatch (beam displacement, tilt, and beam-size difference), which is generated from a self-imaging optical parametric oscillator below the threshold. We investigate the quantum properties of the generated light when the oscillator is detuned from the ideal self-imaging condition for stable operation. We find that the generated light is more robust to mode mismatch than single-mode squeezed light having the same squeezing level, and it even outperforms the single-mode infinitely squeezed light as the strength of mode mismatch increases.
We show that the multimode squeezed light from a self-imaging optical parametric oscillator has the robustness of maintaining the squeezing level to spatial mode mismatch. This light outperforms single-mode infinitely squeezed light against massive mode-mismatch.
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