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arxiv: 2605.31160 · v1 · pith:TWQE6TQZnew · submitted 2026-05-29 · 🪐 quant-ph

Erasing photons from bright squeezed vacuum light via above-threshold ionization

J. Rivera-Dean , T. Rook , G. Singh , P. Stammer , M. Khokhlova , E. Pisanty , C. Figueira de Morisson Faria This is my paper

Pith reviewed 2026-06-28 22:28 UTC · model grok-4.3

classification 🪐 quant-ph
keywords strong-field ionizationsqueezed vacuumSchrödinger cat statesphoton subtractionabove-threshold ionizationquantum opticsBell inequalitynon-Gaussian states
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The pith

Above-threshold ionization from bright squeezed light generates large Schrödinger cat states by heralding photon subtraction.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that above-threshold ionization driven by bright squeezed vacuum light serves as an effective way to subtract photons from the light field through the detection of photoelectrons. This process acts like a high-intensity version of standard photon subtraction, allowing the creation of optical Schrödinger cat states with larger amplitudes than previously possible. A sympathetic reader would care because it opens a path to engineering macroscopic quantum states of light using strong-field techniques, which could impact both fundamental tests of quantum mechanics and practical quantum technologies. The work shows that these states retain non-Gaussian features that can be tuned by the photoelectron momentum and can violate Bell inequalities despite some experimental noise.

Core claim

Above-threshold ionization driven by bright squeezed light provides a strong-field analogue of photon subtraction, where photoelectron detection acts as a high-intensity heralding mechanism, enabling the generation of large amplitude optical Schrödinger cat states. The resulting non-Gaussian features can be tuned via the detected photoelectron momentum and remain robust against finite momentum resolution at the heralding step. Despite the noise, the generated states can be manipulated to violate a Bell inequality.

What carries the argument

Above-threshold ionization driven by bright squeezed light acting as an effective photon subtraction via photoelectron detection as the heralding mechanism.

Load-bearing premise

The strong-field ionization dynamics can be treated as an effective photon subtraction operation on the squeezed vacuum without significant additional distortions or multi-electron effects.

What would settle it

An experiment that detects photoelectrons from bright squeezed vacuum but measures no negativity in the Wigner function of the heralded light or no Bell inequality violation beyond standard photon subtraction limits would falsify the claim.

Figures

Figures reproduced from arXiv: 2605.31160 by C. Figueira de Morisson Faria, E. Pisanty, G. Singh, J. Rivera-Dean, M. Khokhlova, P. Stammer, T. Rook.

Figure 1
Figure 1. Figure 1: FIG. 1. Pictorial representation highlighting the similarities [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Norm of the coherent state probability amplitudes [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Norm of the coherent state probability amplitudes [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Solutions to Eqs. ( [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Non-Gaussian properties of the generated state, [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Effect of finite resolution in the heralding step. (a) [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Analysis of the CHSH violation induced by the ATI [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. (a) Absolute value of the coefficient function [PITH_FULL_IMAGE:figures/full_fig_p024_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Effective distribution [PITH_FULL_IMAGE:figures/full_fig_p025_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: shows the solutions to the saddle-point equations (A54) and (A55). In this case, and for the evaluated times, we have that pf = p˜f . Under this condition, the fields parametrized by Re[εx] reach their maximum amplitude at t ≃ 27.5, 82.7 and 137.8 a.u., and we thus find for p = 0 and p = (0.5⊥, 0∥) [ [PITH_FULL_IMAGE:figures/full_fig_p027_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Maximum value of Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p029_11.png] view at source ↗
read the original abstract

While the interface between strong-field physics and quantum optics offers a unique regime for combining extreme nonlinearity with quantum optical resources, its potential for generating non-classical states of light remains largely unexplored. Standard protocols for generating optical Schr\"odinger cat states, such as photon subtraction from squeezed light, are inherently limited in the achievable macroscopicity of the state and its scalability. In this work, we bridge this gap by demonstrating that above-threshold ionization driven by bright squeezed light provides a strong-field analogue of photon subtraction, where photoelectron detection acts as a high-intensity heralding mechanism, enabling the generation of large amplitude optical Schr\"odinger cat states. We characterize the resulting non-Gaussian features and show that they can be tuned via the detected photoelectron momentum, and study their robustness against the experimental imperfections arising from finite momentum resolution at the heralding step. Despite the noise, we show that the generated states can be manipulated to violate a Bell inequality, thereby highlighting their potential for foundational and practical applications. Our results establish strong-field processes as a scalable platform for macroscopic quantum state engineering, opening a route to quantum optics in previously inaccessible regimes.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 3 minor

Summary. The manuscript proposes that above-threshold ionization (ATI) driven by bright squeezed vacuum light acts as a strong-field analogue of photon subtraction. Photoelectron detection serves as a high-intensity herald, generating large-amplitude optical Schrödinger cat states. The work derives the conditional optical state via the strong-field approximation, characterizes its non-Gaussian features and Wigner-function interference, shows tunability through detected photoelectron momentum, incorporates finite momentum resolution into the heralding operator, and demonstrates that the resulting states violate a Bell inequality after post-processing under the single-active-electron approximation.

Significance. If the effective mapping from ATI dynamics to photon subtraction holds, the approach offers a scalable route to macroscopic cat states that circumvents the intensity limits of conventional photon-subtraction protocols. Strengths include the explicit folding of experimental momentum resolution into the herald, the demonstration of Bell violation despite noise, and the use of the strong-field approximation to obtain a concrete conditional state whose Wigner function exhibits the expected interference.

minor comments (3)
  1. The abstract and introduction use the phrase 'erasing photons' without a precise definition; a short clarifying sentence in §2 linking this terminology to the effective subtraction operator would improve readability.
  2. Figure captions for the Wigner-function plots should explicitly state the momentum bin width used in the heralding operator so that readers can directly compare the plotted interference visibility to the robustness analysis in the text.
  3. A reference to the original strong-field approximation literature (e.g., the Lewenstein model) is missing in the derivation paragraph of the conditional-state section.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript, accurate summary of its contributions, and recommendation for minor revision. We appreciate the recognition of the work's potential as a scalable route to macroscopic cat states.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper models above-threshold ionization under the strong-field approximation as an effective photon-subtraction channel on bright squeezed vacuum, deriving the conditional optical state and its Wigner function directly from standard quantum-optical and SFA equations. No predictions reduce to fitted parameters by construction, no self-definitional mappings appear, and no load-bearing self-citations or ansatzes imported from prior author work are required for the central claim. The resulting cat-state features and Bell-inequality violation follow from the heralding operator and post-processing without circular reduction to the input squeezed state. The derivation remains self-contained against external benchmarks in strong-field and quantum optics.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review provides no details on free parameters, axioms, or invented entities; none can be identified.

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Forward citations

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  1. Emergence of Gaussian entanglement and non-Gaussianity in high-harmonic generation driven by bright squeezed light

    quant-ph 2026-06 unverdicted novelty 7.0

    Bichromatic HHG with coherent drive at ω and perturbative BSV at 2ω yields multimode Gaussian entanglement in even harmonics, modeled as a collective squeezed mode over the harmonic manifold.

Reference graph

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