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Open Quantum Systems Decoherence

Gain-induced spectral non-degeneracy in type-II parametric down-conversion

arXiv
Authors: Behnood Taheri, Denis Kopylov, Manfred Hammer, Torsten Meier, Jens Förstner, Polina Sharapova

Year

2026

Paper ID

22487

Status

Preprint

Abstract Read

~2 min

Abstract Words

95

Citations

N/A

Abstract

We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to non-degenerate PDC with increasing parametric gain. This effect, originating from the second-order dispersion terms, significantly alters the properties of PDC in the high-gain regime, where it leads to increased distinguishability of the generated photon pairs. The effect is established by evaluating a rigorous theoretical model, which is based on solving a system of coupled integro-differential equations for monochromatic operators. The widely used spatially-averaged approximate model fails to reproduce this important effect.

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  • We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2603.01656 [2] arXiv https://arxiv.org/abs/2603.01656 [3] Publisher https://arxiv.org/abs/2603.01656

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