Photon Statistics as a Control Knob: Synthesizing Bright Squeezed Vacuum, Chiral Waveguides, Non-Classical State Engineering, and Quantum-Enhanced Sensing

Version 2 — revised in response to an external structural review and an automated critique pass. See "Response to Review" appendix in the PDF for the change log.

A cluster of recent results across quantum optics, photonics, and atom-photon interaction suggests a unifying thesis: the **photon-number statistics of the driving or probe field** — whether thermal, coherent, squeezed, or manifestly non-Gaussian — function as an active control degree of freedom that determines the character of the quantum state produced, the fidelity of a light-matter interface, and the precision ceiling of a sensing protocol, rather than merely setting a noise floor to be minimised. We synthesise five specific findings to argue this point, treating the synthesis as a *heuristic reading* of the corpus rather than a formal derivation. First, bright squeezed vacuum (BSV) light enables photon-subtraction-like operations at high intensity via above-threshold ionisation, generating large-amplitude optical Schrödinger cat states whose non-Gaussian character is tunable through the detected photoelectron momentum [corpus:arxiv:2605.31160]. Second, the same BSV resource, combined with single-shot quadrature measurement, heralds macroscopic quantum superpositions in matter on ultrafast timescales, with the squeezing amplitude directly controlling the preparation speed of zero-eigenvalue Dicke states [corpus:arxiv:2605.30224]. Third, chiral light-matter coupling in slow-light photonic-crystal waveguides is not fixed by geometry alone but can be electrically inverted through the quantum-confined Stark effect, demonstrating that the local optical chirality — a mode-structure property — acts as a tunable interface parameter [corpus:arxiv:2605.30047]. Fourth, superradiant intensity correlations of order *m* ≥ 2 from *N* thermal light sources provide a Cramér–Rao bound improvement scaling as 1/*N* relative to conventional LIDAR, showing that photon-bunching statistics encode metrological information inaccessible to first-order intensity measurements [corpus:arxiv:2605.28378]. Fifth, spin noise spectroscopy reveals a quadratic density dependence of spin noise variance in warm rubidium vapour that is attributable to resonant dipole-dipole interactions mediated by residual optical excitation; this result is included as a weakly-connected addendum because the probe field is coherent rather than non-Gaussian, and the connection to the photon-statistics thesis operates at the level of probe power and detuning rather than quantum statistical character [corpus:arxiv:2605.31262]. Together, these results are consistent with — though do not uniquely establish — the hypothesis that photon statistics constitute a primary design variable for quantum state engineering, chiral interfaces, and precision metrology. Falsification paths for each sub-claim are identified throughout. ---

Authorship: Saluca Agentic AI Research Team (Saluca LLC). AI-drafted from arXiv preprint corpus on the date in the filename.

Cited arXiv preprints: 2605.28378, 2605.30047, 2605.30224, 2605.31160, 2605.31262