Frequency-resolved N-photon correlations in the ultra-strong coupling regime

• URL: http://arxiv.org/abs/2603.14201v1
• Date: Sun, 15 Mar 2026 03:20:21 GMT
• Title: Frequency-resolved N-photon correlations in the ultra-strong coupling regime
• Abstract summary: We study frequency-resolved N-photon correlations in an ultrastrongly coupled cavity QED system.<n>We show that parity symmetry plays a decisive role in shaping these correlations.<n>Our work extends frequency-resolved correlations to the ultra-strong coupling regime and demonstrates their potential as a sensitive probe of symmetry in light-matter interaction systems.
• Score: 6.318660452972645
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Frequency-resolved photon emission is central to applications from quantum information encoding to high-resolution spectroscopy, and then studying their correlations is therefore essential for revealing the underlying emission pathways and multiphoton statistics. Here, we investigate frequency-resolved N-photon correlations in an ultrastrongly coupled cavity QED system where a qubit interacts with a single-mode cavity. Owing to counter-rotating interactions, the eigenstates and energy spectrum are strongly modified, giving rise to rich spectral and statistical properties in the emitted frequency-resolved photons. Through frequency-selective detection, we reveal pronounced multiphoton antibunching, as well as multiphoton bunching originating from cascade transitions among dressed eigenstates. In particular, we show that parity symmetry plays a decisive role in shaping these correlations. The symmetry-breaking opens additional transition channels and dramatically enhances the generation of correlated photon pairs and even photon triplets of different frequencies. Our work extends frequency-resolved correlations to the ultra-strong coupling regime and demonstrates their potential as a sensitive probe of symmetry in light-matter interaction systems.

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