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arXiv · 2605.15945

Generating collective spin cat states via photon-number measurements near the Dicke critical point

Taiga Nakamoto·Shohei Imai·Kazuaki Takasan
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Abstract

We propose a method for generating collective spin cat states in a cavity-coupled atomic ensemble by exploiting strong light-matter entanglement and anti-squeezing associated with the superradiant phase transition. We numerically and analytically demonstrate that the cat states can be heralded by photon-number measurement on the ground state of the Dicke model. The near-critical regime enhances both the cat-state size and the probability of obtaining larger photon-number outcomes, and outcomes with larger photon numbers yield even larger cat states. We also show that a thermodynamic-limit analysis clarifies the generation mechanism and connects it to a natural light-matter analogue of generalized photon subtraction for optical cat-state generation. These results suggest that exploiting criticality in strongly coupled light-matter systems could open new directions for matter-based many-body quantum technologies.

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Taiga Nakamoto, Shohei Imai, Kazuaki Takasan. 2026-05-15. Generating collective spin cat states via photon-number measurements near the Dicke critical point. https://arxiv.org/abs/2605.15945

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