Generation of energy-time entangled triphotons in a six-level cold atomic system

• URL: http://arxiv.org/abs/2604.18110v1
• Date: Mon, 20 Apr 2026 11:27:26 GMT
• Title: Generation of energy-time entangled triphotons in a six-level cold atomic system
• Abstract summary: We investigate the generation of energy-time-entangled triphotons in a six-level cold atomic ensemble.<n>Results lay the groundwork for the experimental preparation of triphotons using six-level systems.
• Score: 1.6026980464879068
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Multiphoton entangled states are pivotal resources for implementing optical quantum information protocols. Recently, energy-time-entangled triphotons have been observed in hot atomic ensembles. However, in these protocols, the complex fifth-order nonlinear susceptibility entailed by four- or five-level systems limits our understanding of triphoton generation. Here, to directly capture the generation mechanism of triphotons and their associated optical properties, we investigate the generation of energy-time-entangled triphotons in a six-level cold atomic ensemble. The fifth-order nonlinear susceptibility indicates the existence of two sets of spontaneous six-wave mixing in the system. Notably, triphoton generation in this system is subject to stringent timing constraints. Collectively, these characteristics give rise to threefold coincidence counts, which -- dominated by the fifth-order nonlinear susceptibility -- exhibit asymmetrically damped Rabi oscillations in the two-dimensional time domain. Furthermore, we analytically derive that the temporal correlation properties of conditional two-photon states are preserved -- a unique feature of $W$-class tripartite entanglement. These results not only lay the groundwork for the experimental preparation of triphotons using six-level systems but also provide key support for understanding the generation mechanism of triphotons involving more complex fifth-order nonlinear susceptibilities.

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