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Orbital Angular Momentum Control of Entanglement in Dual-Cavity Ring Bose–Einstein Condensates
by Muqaddar Abbas, Ghaisud Din
Submission summary
| Authors (as registered SciPost users): | Muqaddar Abbas |
| Submission information | |
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| Preprint Link: | scipost_202601_00011v1 (pdf) |
| Date submitted: | Jan. 7, 2026, 2:12 a.m. |
| Submitted by: | Muqaddar Abbas |
| Submitted to: | SciPost Physics Core |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
We study quantum correlations in a system of two optically coupled cavities, each containing a ring-shaped Bose--Einstein condensate confined in a toroidal potential. The condensates interact with cavity fields through an angular optical lattice generated by degenerate modes carrying opposite orbital angular momentum (OAM), while photon hopping mediates inter-cavity coupling. Using a linearized quantum Langevin formalism, we analyze the steady-state covariance matrix and quantify bipartite along with tripartite entanglement among collective atomic side modes and cavity fields. We show that OAM and photon hopping provide efficient control over the strength and distribution of quantum correlations, enabling entanglement between spatially separated condensates. The robustness of these correlations against thermal effects is examined, revealing enhanced stability of atom--cavity entanglement compared to purely atomic correlations. Phase-space representations based on Wigner functions are used to illustrate the steady-state fluctuation dynamics. Our results establish coupled cavity systems with ring-shaped condensates as a tunable platform for controlled matter--light correlations.