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arXiv · 2610.38878

Drive-tunable Floquet exchange spectroscopy with Hong--Ou--Mandel interference

Eric R Bittner
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Abstract

Floquet driving reshapes cavity spectra, but single-photon sideband populations do not reveal how it changes two-photon exchange. Here we show theoretically that delay-resolved Hong--Ou--Mandel (HOM) coincidences can probe this response in a collectively coupled cavity. A frequency-entangled signal photon scatters linearly from the driven cavity while its idler provides a delayed reference. Averaging over an unsynchronized drive phase removes coherence between different net output orders but preserves exchange interference within each order. Fourier transformation of the coincidence trace yields two drive-dependent exchange branches associated with the Floquet-polariton spectrum. As the drive changes, the branches shift and exchange weight; the dominant physical output order also changes, a transfer not reproduced by single-photon sideband populations. We further map the coincidence-trace response over drive frequency and amplitude and connect it to a count-model-dependent Fisher information. Floquet control thus adds a tunable exchange spectrum to HOM interferometry and gives quantitative targets for an experiment.

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Eric R Bittner. 2026-10-28. Drive-tunable Floquet exchange spectroscopy with Hong--Ou--Mandel interference. https://arxiv.org/abs/2610.38878

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