Quantum-coherent nonlinear interferometry using electron-phonon systems for entanglement-assisted terahertz sensing
- URL: http://arxiv.org/abs/2510.26129v1
- Date: Thu, 30 Oct 2025 04:29:55 GMT
- Title: Quantum-coherent nonlinear interferometry using electron-phonon systems for entanglement-assisted terahertz sensing
- Authors: Junya Ogiri, Hiroaki Minamide, Kunio Ishida,
- Abstract summary: We present a theoretical framework for quantum-coherent nonlinear interferometry.<n>By explicitly retaining the quantum coherence of the coupled electron-phonon-photon dynamics, our model describes a two-stage buildup of entanglement.<n>This coherent light-matter interaction imprints the internal dynamics of the medium onto the interferometer output, yielding phase-sensitive interference.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present a theoretical framework for quantum-coherent nonlinear interferometry in which the nonlinear medium is modeled as active electron-phonon quantum systems rather than a passive $\chi^{(2)}$ converter. By explicitly retaining the quantum coherence of the coupled electron-phonon-photon dynamics, our model describes a two-stage buildup of entanglement - first between signal and idler photons and subsequently between idler photons mediated by material coherence. This coherent light-matter interaction imprints the internal dynamics of the medium onto the interferometer output, yielding phase-sensitive interference that enables indirect readout of terahertz-band signal modes via near-infrared detection. The results reveal a route toward entanglement-assisted terahertz sensing and establish a general framework for treating nonlinear quantum media as active components in interferometric architectures.
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