We theoretically study the collision-induced constructive quantum interference in an open four-level system with the density-matrix approach based on the experimental observation of constructive quantum interference between two transition pathways ${3P}_{1/2}\ensuremath{-}5S$ (or $4D)$ and ${3P}_{3/2}\ensuremath{-}5S$ (or $4D)$ via equal-frequency hybrid excitation in the ${\mathrm{Na}}_{2}\ensuremath{-}\mathrm{Na}$ system. The effects of the collision-induced coherent and incoherent decay rates and the ratio of the two transition dipole moments on the interference are analyzed. It is shown that through the incoherent process (collision), the coherence between a widely separated doublet and subsequent constructive quantum interference can be realized. The physical origin of the constructive interference can be seen clearly in the dressed-atom picture. The theoretical results can also be used to qualitatively explain the dependence of quantum interference on the experimental buffer gas pressure and sample temperature.We theoretically study the collision-induced constructive quantum interference in an open four-level system with the density-matrix approach based on the experimental observation of constructive quantum interference between two transition pathways ${3P}_{1/2}\ensuremath{-}5S$ (or $4D)$ and ${3P}_{3/2}\ensuremath{-}5S$ (or $4D)$ via equal-frequency hybrid excitation in the ${\mathrm{Na}}_{2}\ensuremath{-}\mathrm{Na}$ system. The effects of the collision-induced coherent and incoherent decay rates and the ratio of the two transition dipole moments on the interference are analyzed. It is shown that through the incoherent process (collision), the coherence between a widely separated doublet and subsequent constructive quantum interference can be realized. The physical origin of the constructive interference can be seen clearly in the dressed-atom picture. The theoretical results can also be used to qualitatively explain the dependence of quantum interference on the experimental buffer gas pressure and sample temperature.

Physical Review AJun 17, 200313 citations

Quantum interference in electron collision

R.C. Liu, Brian Odom, Y. Yamamoto +1 more

NatureJan 1, 1998249 citations

Observation of temporal quantum interference via two collision-assisted two-step excitations

Xihua Yang, Zhenrong Sun, Zugeng Wang

We report the experimental observation of temporal quantum interference between two time-delayed 3S-3P-5S (or 4D) transition pathways created through two collision-assisted two-step excitation processes by using a single nanosecond laser pulse in the ${\mathrm{Na}}_{2}\text{\ensuremath{-}}\mathrm{Na}$ system. It is clearly shown that the collisions offer a promising alternative to realize quantum interference in the time domain at room or higher temperatures despite the dephasing nature.We report the experimental observation of temporal quantum interference between two time-delayed 3S-3P-5S (or 4D) transition pathways created through two collision-assisted two-step excitation processes by using a single nanosecond laser pulse in the ${\mathrm{Na}}_{2}\text{\ensuremath{-}}\mathrm{Na}$ system. It is clearly shown that the collisions offer a promising alternative to realize quantum interference in the time domain at room or higher temperatures despite the dephasing nature.

Physical Review AOct 16, 200714 citations

Quantum Interference in Phase Space

Springer eBooksSep 12, 20050 citations

Coherent Control In Ultrafast Photon Echo Spectroscopy: Liouville-Space Pathways Interference

Maxim S. Pshenichnikov, Wim P. de Boeij, Douwe A. Wiersma

Dephasing-induced resonances, arising from interference between different excitation pathways, are well-known in frequency-domain spectroscopy.[1] It is generally thought that the time-domain analog of this phenomena is difficult to achieve due to the explicit time ordering of the interaction fields.[2,3] In this contribution we report on the observation of time-domain interference in phase-locked stimulated photon echo. We also show how complete control over the interference effect can be exercised.Dephasing-induced resonances, arising from interference between different excitation pathways, are well-known in frequency-domain spectroscopy.[1] It is generally thought that the time-domain analog of this phenomena is difficult to achieve due to the explicit time ordering of the interaction fields.[2,3] In this contribution we report on the observation of time-domain interference in phase-locked stimulated photon echo. We also show how complete control over the interference effect can be exercised.

International Conference on Ultrafast PhenomenaJan 1, 19960 citations

4D)

and ${3P}_{3/2}\ensuremath{-}5S$ (or

4D)

via equal-frequency hybrid excitation in the ${\mathrm{Na}}_{2}\ensuremath{-}\mathrm{Na}$ system. The effects of the collision-induced coherent and incoherent decay rates and the ratio of the two transition dipole moments on the interference are analyzed. It is shown that through the incoherent process (collision), the coherence between a widely separated doublet and subsequent constructive quantum interference can be realized. The physical origin of the constructive interference can be seen clearly in the dressed-atom picture. The theoretical results can also be used to qualitatively explain the dependence of quantum interference on the experimental buffer gas pressure and sample temperature.