Photon blockade via three-body interactions: toward high-purity and bright single-photon sources

• URL: http://arxiv.org/abs/2605.21942v2
• Date: Thu, 28 May 2026 12:09:13 GMT
• Title: Photon blockade via three-body interactions: toward high-purity and bright single-photon sources
• Abstract summary: We introduce a fundamentally new photon blockade mechanism by utilizing three-body interactions between a single photonic mode and two qubits.<n>This kind of interaction intrinsically cuts off the excitation path to the two-photon state, resulting in a perfect photon blockade effect.<n>Remarkably, it breaks the purity-brightness trade-off, enabling the simultaneous achievement of extreme purity and high brightness.
• Score: 21.959817015002937
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Photon blockade is vital for single-photon generation, but current schemes with conventional and unconventional photon blockade face critical limitations like the purity-brightness trade-off, hindering the generation of high-performance single-photons. To overcome these limitations, we introduce a fundamentally new photon blockade mechanism by utilizing three-body interactions between a single photonic mode and two qubits. This kind of interaction intrinsically cuts off the excitation path to the two-photon state, resulting in a perfect photon blockade effect. The mechanism operates across a broad parameter range, free from the constraints of strong coupling or weak driving. Remarkably, it breaks the purity-brightness trade-off, enabling the simultaneous achievement of extreme purity and high brightness, both significantly outperforming previous mechanisms. Furthermore, this approach demonstrates robustness against thermal noise and avoids unwanted oscillations in the time-delayed correlation function. This work provides a path for generating high-purity, high-brightness, and robust single-photon sources, a key resource for quantum technologies.

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