Abstract

The photon pair generation (PPG) via spontaneous four-wave mixing (SFWM) in an optically excited third-order nonlinear cavity forms large-scale high-dimensional quantum states, called quantum frequency combs (QFC). The scalable practical generation and control of these photonic states via integrated devices enable quantum in-formation processing for applications in secured communications and quantum computing [1]. Modifying the excitation field properties in different degrees of freedom, e.g., polarization [2], frequency or spatial modes [3], allows controlling the structure of the generated quantum state by favoring different types of SFWM processes. In this work, by using two excitation fields and varying their intensity, P₁ and P₂, respectively, we demonstrate the occurrence of two different SFWM processes (degenerately and non-degenerately excited SFWM) and a control of the pair generation rate: µ(r,P) = µ₁(P₁(r,P))+ µ₂(P₂(r,P))+ µ_ND(r,P), where P is the total excitation power, r = P₁/P is the power ratio, µ₁, µ₂ describe the degenerate process and µ_ND the non-degenerate process.

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