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

• URL: http://arxiv.org/abs/2605.15945v1
• Date: Fri, 15 May 2026 13:29:09 GMT
• Title: Generating collective spin cat states via photon-number measurements near the Dicke critical point
• Abstract summary: We propose a method for generating collective spin cat states in a cavity-coupled atomic ensemble by exploiting strong light-matter entanglement.<n>We numerically and analytically demonstrate that the cat states can be heralded by photon-number measurement on the ground state of the Dicke model.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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