2008/12/27 by Christian Weedbrook, Ben Perrett, Weedbrook, Christian +11
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Laser-Matter Interactions and Applications #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.48550/arxiv.0812.4749
7 pages, 13 figures
arxiv created 2008/12/27 · openalex publication_date 2008/12/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We analyze an optical parametric oscillator (OPO) in which cascaded down-conversion occurs inside a cavity resonant for all modes but the initial pump. Due to the resonant cascade design, the OPO present two χ2 level oscillation thresholds that are therefore remarkably lower than for a χ3 OPO. This is promising for reaching the regime of an effective third-order nonlinearity well above both thresholds. Such a χ2 cascaded device also has potential applications in frequency conversion to far infra-red regimes. But, most importantly, it can generate novel multi-partite quantum correlations in the output radiation, which represent a step beyond squeezed or entangled light. The output can be highly non-Gaussian, and therefore not describable by any semi-classical model.