Coherent Conversion of an Interacting Dark-State-Polariton Condensate into a Photonic Bose-Einstein Condensate
Abstract
An interacting condensate can retain an observable imprint of its preparation after the interactions are switched off. For light, accessing this regime requires separating the formation of a photon condensate from the material medium that redistributes its energy. We investigate a multimode-cavity scheme in which an interacting dark-state-polariton condensate is coherently converted into a confined photonic Bose-Einstein condensate as the atom-cavity coupling is removed. The polariton mass, matter fraction, and particle number control the condensate occupation during preparation. Remarkably, changing the mass also modifies the condensate's response to repulsion through the spatial overlap of its orbitals, even when the entire single-particle spectrum is held fixed. Ideal mode-preserving conversion conserves the full natural-orbital occupation spectrum, while finite-time few-body calculations show that additional occupation changes during transfer are much smaller than those established during interacting preparation. Once decoupled from matter, the photons evolve under the free cavity Hamiltonian while retaining correlations acquired in the interacting gas. Interference between cavity modes produces oscillations in the photon density, while resonant pair correlations persist after interaction removal and distinguish the resulting photon state from a quadratic thermal state with the same one-body density matrix.
Related
- Observation of a supersolid phase in a spin-orbit coupled exciton-polariton Bose-Einstein condensate
- Non-local Stabilization and Synchronization of Larmor Precession in Trapped Polariton Condensate Dimer
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- Deterministic Vortex Generation from Coupled Trapped Polariton Condensate Triad
- Polariton-polariton coherent coupling in a molecular spin-superconductor chip
BibTeX
@misc{neto2026coherent,
title = {{Coherent Conversion of an Interacting Dark-State-Polariton Condensate into a Photonic Bose-Einstein Condensate}},
author = {G. D. de Moraes Neto and M. A. de Ponte and N. G. de Almeida and Miled H. Y. Moussa},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.11180},
eprint = {2611.11180},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.11180},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coherent Conversion of an Interacting Dark-State-Polariton Condensate into a Photonic Bose-Einstein Condensate
AU - G. D. de Moraes Neto
AU - M. A. de Ponte
AU - N. G. de Almeida
AU - Miled H. Y. Moussa
PY - 2026
DA - 2026/11/08
PB - arXiv
DO - 10.48550/arxiv.2611.11180
UR - https://arxiv.org/abs/2611.11180
AB - An interacting condensate can retain an observable imprint of its preparation after the interactions are switched off. For light, accessing this regime requires separating the formation of a photon condensate from the material medium that redistributes its energy. We investigate a multimode-cavity scheme in which an interacting dark-state-polariton condensate is coherently converted into a confined photonic Bose-Einstein condensate as the atom-cavity coupling is removed. The polariton mass, matter fraction, and particle number control the condensate occupation during preparation. Remarkably, changing the mass also modifies the condensate's response to repulsion through the spatial overlap of its orbitals, even when the entire single-particle spectrum is held fixed. Ideal mode-preserving conversion conserves the full natural-orbital occupation spectrum, while finite-time few-body calculations show that additional occupation changes during transfer are much smaller than those established during interacting preparation. Once decoupled from matter, the photons evolve under the free cavity Hamiltonian while retaining correlations acquired in the interacting gas. Interference between cavity modes produces oscillations in the photon density, while resonant pair correlations persist after interaction removal and distinguish the resulting photon state from a quadratic thermal state with the same one-body density matrix.
ER -