Modification of Spontaneous Emission via Quantum Interference

S. Yang, Shi-Yao Zhu, Muhammad Suhail Zubairy

Hwang Lee, Pavel G. Polynkin, Marlan O. Scully

Seyyed Hossein Asadpour, Mostafa Sahrai, A. Soltani +1 more

Shuai Yang, Jun Xu, Shi‐Yao Zhu +1 more

Quantum interference in spontaneous emission from a four-level atom is investigated with the counter-rotating terms and the energy shifts included. The atom has two upper levels which are coupled to a common lower level by the same vacuum modes and are driven by a coherent field to an auxiliary level. The effect of the counter-rotating terms in the coupling through the vacuum modes is taken into account by a unitary transformation method. We show how the quantum interference due to the energy shifts affects the spontaneous emission.

Jiaren Liu, Zhiyi Zhang, Xiao George +1 more

The spontaneous emission spectrum of a ladder three-level atom with an upper transition driven by a coherent field is calculated under a universal model where various decays, any incoherent pumping and coherent driving are taken into account. The analytical expression for the spectrum profile is given on the basis of the quantum regression theorem. To our knowledge, it is the first time that the quantitative criterion condition Ω<|γ ab −γ ac |, under which quantum destructive interference induced by the coherent driving field occurs, is deduced for the modification of spontaneous emission from the middle level to the ground level. The roles and limits of incoherent pumping, coherent driving and experimental configuration are discussed for realizing the quantum interference and reducing the Doppler effects.

Sihua Yuan, J.-Y. Gao