Emission of time-ordered photon pairs from a single polaritonic Bogoliubov mode

• URL: http://arxiv.org/abs/2601.06468v1
• Date: Sat, 10 Jan 2026 07:27:31 GMT
• Title: Emission of time-ordered photon pairs from a single polaritonic Bogoliubov mode
• Authors: Ferdinand Claude, Yueguang Zhou, Sylvain Ravets, Jacqueline Bloch, Martina Morassi, Aristide Lemaître, Alberto Bramati, Anna Minguzzi, Iacopo Carusotto, Irénée Frérot, Maxime Richard,
• Abstract summary: We report on the direct observation of the peculiar microscopic quantum structure of bosonic excitations.<n>We observe that upon decreasing the average number of fluctuation quanta below unity, large pair correlations build up together with strong time-ordering of the emitted photons.<n>This behavior is a direct signature of the particle-hole quantum superposition which is at the heart of Bogoliubov excitations.
• Score: 20.63417290000743
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In many-body quantum systems, interactions drive the emergence of correlations that are at the heart of the most intriguing states of matter. A remarkable example is the case of weakly interacting bosonic systems, whose ground state is a squeezed vacuum state, and whose elementary excitations have a collective nature. In this work, we report on the direct observation of the peculiar microscopic quantum structure of these elementary excitations. We perform time- and frequency-resolved two-photon correlation measurements on the fluctuations of weakly interacting polaritons in a resonantly-driven microcavity, and observe that upon decreasing the average number of fluctuation quanta below unity, large pair correlations build up together with strong time-ordering of the emitted photons. This behavior is a direct signature of the particle-hole quantum superposition which is at the heart of Bogoliubov excitations.

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