利用电磁诱导透明建立强Kerr非线性和光子开关的单光子失谐容限

One-photon detuning tolerance for large Kerr nonlinearity and photon switching via electromagnetically induced transparency

在三能级介质中,产生电磁诱导透明的条件是双光子共振,对单光子失谐没有限制.本文得到的结果显示:将微扰引入电磁诱导透明产生强非线性光学效应时,给单光子失谐带来明显限制.具体来说,当电磁诱导透明效应用于制备强Kerr非线性介质和设计光子开关时,单光子失谐量的取值范围应远小于耦合场和信号场的强度比与微扰跃迁的失谐量或衰减速率之积.

In a three-level Λ system, as long as the exact two-photon resonance is satisfied and no matter what one-photon detuning is, electromagnetically induced transparency can be achieved. In this paper we show that we must take into account one-photon detuning tolerance when the systems based on perturbed EIT produce new nonlinear optical effects. In detail, one-photon detuning for large Kerr nonlinearity and photon switching via electromagnetically induced transparency should be far less than the product of the ratio of the intensity of the coupling field to the intensity of the signal field and the detuning or the decay rate of the additional transition.