Kerr-induced non-Gaussianity of ultrafast bright squeezed vacuum

• URL: http://arxiv.org/abs/2512.17797v1
• Date: Fri, 19 Dec 2025 17:01:39 GMT
• Title: Kerr-induced non-Gaussianity of ultrafast bright squeezed vacuum
• Abstract summary: Non-Gaussian states of light are a critical resource for fault-tolerant quantum computing.<n>We show the deterministic generation of a bright non-Gaussian state by introducing a Kerr nonlinearity to a macroscopic state of light.<n>This work bridges the gap between quantum optics and ultrafast nonlinear optics, opening a path to quantum applications.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-Gaussian states of light are a critical resource for fault-tolerant quantum computing and enhanced metrology, but are typically faint and often obtained via post-selection. Here, we demonstrate the deterministic generation of a bright non-Gaussian state by introducing a Kerr nonlinearity to a macroscopic state of light called bright squeezed vacuum (BSV). To characterize the resulting state, we use a single-shot f-2f interferometer to sample its Husimi function. We observe a clear transformation from a 2D Gaussian distribution to an 'S'-shaped non-Gaussian profile, which is the direct statistical evidence of the intensity-dependent nonlinear phase. The negativity of the Wigner function, which is an intrinsic property of any pure non-Gaussian state, cannot be observed because BSV is a mixed state even under minute optical loss. However, we show that BSV can be considered as a mixture of pure squeezed coherent states, for some of which Kerr-induced Wigner-function negativity is quite tolerant to loss. This work bridges the gap between quantum optics and ultrafast nonlinear optics, opening a path to quantum applications that require high photon flux.

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