Transition rates between coupled states in a quantum system depend on the density of available final states. The radiative decay of an excited atomic state has been suppressed by reducing the density of electromagnetic vacuum modes near the atomic transition. Likewise, reducing the density of available momentum modes of the atomic motion when it is embedded inside a Fermi sea will suppress spontaneous emission and photon scattering rates. Here we report the experimental demonstration of suppressed light scattering in a quantum degenerate Fermi gas. We systematically measured the dependence of the suppression factor on the temperature and Fermi energy of a strontium quantum gas and achieved suppression of scattering rates by up to a factor of 2 compared with a thermal gas.

中文翻译：

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原子光散射的泡利阻挡

量子系统中耦合态之间的跃迁率取决于可用最终态的密度。通过降低原子跃迁附近的电磁真空模式的密度，可以抑制激发原子态的辐射衰变。同样，当原子运动嵌入费米海时，降低其可用动量模式的密度将抑制自发发射和光子散射率。在这里，我们报告了量子简并费米气体中抑制光散射的实验证明。我们系统地测量了抑制因子对锶量子气体的温度和费米能量的依赖性，与热气体相比，实现了高达 2 倍的散射率抑制。