Synthetic and cosmological axion hybridization: entangled photons, (HBT) and quantum beats
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arXiv
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2025
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| author | Boyanovsky, Daniel |
| author_facet | Boyanovsky, Daniel |
| contents | In this article it is argued that synthetic axions, emergent collective excitations in topological insulators or Weyl semimetals hybridize with the cosmological axion, a compelling dark matter candidate via a common two photon decay channel since they both couple to electromagnetic fields via a Chern-Simons term. We point out an analogy to a V-type three level system with the two upper levels identified with the synthetic and cosmological axions decaying into a two-photon state. The Weisskopf-Wigner theory of spontaneous decay in multi level atoms is complemented and extended to describe the dynamics of hybridization. The final two-photon state features both kinematic and polarization entanglement and displays quantum beats as a consequence of the interference between the decay paths. An initial population of either axion induces a population of the other via hybridization. Consequently, a dark matter axion condensate induces a condensate of the synthetic axion, albeit with small amplitude. We obtain a momentum and polarization resolved Hanbury- Brown Twiss (HBT) second order coherence describing coincident correlated two-photon detection. It exhibits quantum beats with a frequency given by the difference between the energies of the synthetic and cosmological axion and \emph{perhaps may be harnessed} to detect either type of axion excitations. The case of synthetic axions individually is obtained in the limit of vanishing coupling of the cosmological axion and features similar two-photon correlations. Hence second order (HBT) two-photon coherence \emph{may} provide an alternative detection mechanism for emergent condensed matter axionic collective excitations. Similarities and differences with parametrically down converted photons are discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_04533 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Synthetic and cosmological axion hybridization: entangled photons, (HBT) and quantum beats Boyanovsky, Daniel Other Condensed Matter Mesoscale and Nanoscale Physics High Energy Physics - Phenomenology High Energy Physics - Theory Quantum Physics In this article it is argued that synthetic axions, emergent collective excitations in topological insulators or Weyl semimetals hybridize with the cosmological axion, a compelling dark matter candidate via a common two photon decay channel since they both couple to electromagnetic fields via a Chern-Simons term. We point out an analogy to a V-type three level system with the two upper levels identified with the synthetic and cosmological axions decaying into a two-photon state. The Weisskopf-Wigner theory of spontaneous decay in multi level atoms is complemented and extended to describe the dynamics of hybridization. The final two-photon state features both kinematic and polarization entanglement and displays quantum beats as a consequence of the interference between the decay paths. An initial population of either axion induces a population of the other via hybridization. Consequently, a dark matter axion condensate induces a condensate of the synthetic axion, albeit with small amplitude. We obtain a momentum and polarization resolved Hanbury- Brown Twiss (HBT) second order coherence describing coincident correlated two-photon detection. It exhibits quantum beats with a frequency given by the difference between the energies of the synthetic and cosmological axion and \emph{perhaps may be harnessed} to detect either type of axion excitations. The case of synthetic axions individually is obtained in the limit of vanishing coupling of the cosmological axion and features similar two-photon correlations. Hence second order (HBT) two-photon coherence \emph{may} provide an alternative detection mechanism for emergent condensed matter axionic collective excitations. Similarities and differences with parametrically down converted photons are discussed. |
| title | Synthetic and cosmological axion hybridization: entangled photons, (HBT) and quantum beats |
| topic | Other Condensed Matter Mesoscale and Nanoscale Physics High Energy Physics - Phenomenology High Energy Physics - Theory Quantum Physics |
| url | https://arxiv.org/abs/2503.04533 |