Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Chinese Physics Letters

Experimental Observation of Constructive Quantum Interference via Hybrid Excitation in an Na 2 -Na System

Xihua Yang, Yongfang Li, Zhenrong Sun, Ding Liang-En, Zugeng Wang

Published Feb 22, 2002• 10 citations
Publisher

Abstract

We report on an experimental observation of constructive quantum interference between two atomic transition pathways 3P 1/2 -5S (or 4D) and 3P 3/2 -5S (or 4D) via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na 2 -Na system. Through the special excitation processes, constructive quantum interference is realized for a Λ-type quantum-beat configuration with a widely-spaced doublet (about 17 cm -1 ) in the excited sodium atom driven by one laser. The dependences of quantum interference on the argon buffer gas pressure and sample temperature are also examined.

DOI
10.1088/0256-307x/19/3/315

Related papers

Constructive interference via collision-aided radiative excitation

Xihua Yang, Zhenrong Sun, Ding Liang-En +1 more

We have studied theoretically constructive interference via collision-aided radiative excitation in an open four-level system using a density matrix approach. The four-level system consists of a Λ-type three-level quantum-beat configuration driven by one laser field and a fourth level coupled by a vacuum mode. It is shown that through the incoherent process (collision), coherence between widely-separated doublets and subsequent constructive interference can be realized. We analyse the effects of the collision-induced coherent and incoherent decay rates, laser intensity and energy separation of the doublets on the interference. Meanwhile, the constructive interference between the two transition pathways 3P 1/2 -4D and 3P 3/2 -4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na 2 -Na system is experimentally observed. A good agreement between the theoretical and experimental results is obtained.

Chinese Physics•Mar 26, 2002•0 citations

Collision-induced constructive quantum interference

Xihua Yang, Hankun Xie

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 A•Jun 17, 2003•13 citations

Constructive interference via collision—aided radiative excitation

杨希华, S Rộng, 丁良恩 +1 more

We have studied theoretically constructive interference via collision-aided radiative excitation in an open fourlevel system using a density matrix approach.The four-leval system consists of a Λ-type three-level quantum-beat configuration driven by one laser field and a fourthe level coupled by a vacuum mode.It is shown that through the incoherent process (collision),coherence between widely-separated doublets and subsequent constructive interference can be realized.We analyse the effects of the collision-induced coherent and incoherent decay rates,laser intensity,and energy separation of the doublets on the interference.Meanwhile,the constructive interference between the two transition pathways 3P1/2-4D and 3P3/2-4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na2-Na system is experimentally observed.A good agreement between the theoretical and experimental results is obtained.

中国物理B：英文版•Jun 13, 2005•0 citations

Competition between Quantum Interference and Stimulated Electronic Raman Scattering Processes via Hybrid Excitation in a Na_2-Na System

Xihua Yang

An experimental observation of the competition between quantum interference and stimulated electronic Raman scattering (SERS) via equal frequency hybrid excitation and collision aided radiative excitation in a Na 2 Na system is reported for the first time. It is found that the SERS for 3P 1/2,3/2 4P are suppressed and the optically pumped stimulated emission (OPSE) for 5S 4P are enhanced dramatically at a particular excitation wavelength where constructive quantum interference between two transitions 3P 1/2 5S and 3P 3/2 5S in atomic sodium takes place. A theoretical analysis based on the dressed atom approach is carried out to explain the experimental results.

中国激光(英文版)•Jan 1, 2002•0 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.

Physical Review A•Oct 16, 2007•14 citations

Collisional modification of the atomic-Na 3s 2 S1/2 –5s 2 S1/2 two-color two-photon polarization spectrum

LeRoy F. Cook, D. A. Olsgaard, Mark D. Havey +1 more

An experimental investigation of the atomic-Na 3s $^{2}$${\mathit{S}}_{1/2--}$5s $^{2}$${\mathit{S}}_{1/2}$ two-color two-photon polarization spectrum has been made. Measurements of the linear polarization degree of the two-photon transition were made for one laser tuned within a \ifmmode\pm\else\textpm\fi{}100 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ range of the atomic-Na 3p $^{2}$${\mathit{P}}_{\mathit{j}}$ levels, with the second adjusted to satisfy the two-photon resonance condition. The relatively short-pulse (\ensuremath{\sim}0.5 ns) lasers used eliminate effects on the spectrum due to atomic-Na hyperfine interactions and radiation trapping, while greatly reducing depolarization due to collisions with Ar gas. In the absence of collisions, the measured polarization spectrum is in excellent agreement with calculations. Measurements of the Ar pressure dependence of the spectrum revealed strong depolarization in the vicinity of resonant excitation through the 3p $^{2}$${\mathit{P}}_{3/2}$ level. A collisional depolarization cross section of 200(30) \AA{} for this process was deduced from the data.

Physical Review A•Jan 1, 1993•16 citations
We report on an experimental observation of constructive quantum interference between two atomic transition pathways 3P 1/2 -5S (or 4D) and 3P 3/2 -5S (or 4D) via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na 2 -Na system. Through the special excitation processes, constructive quantum interference is realized for a Λ-type quantum-beat configuration with a widely-spaced doublet (about 17 cm -1 ) in the excited sodium atom driven by one laser. The dependences of quantum interference on the argon buffer gas pressure and sample temperature are also examined.
We have studied theoretically constructive interference via collision-aided radiative excitation in an open four-level system using a density matrix approach. The four-level system consists of a Λ-type three-level quantum-beat configuration driven by one laser field and a fourth level coupled by a vacuum mode. It is shown that through the incoherent process (collision), coherence between widely-separated doublets and subsequent constructive interference can be realized. We analyse the effects of the collision-induced coherent and incoherent decay rates, laser intensity and energy separation of the doublets on the interference. Meanwhile, the constructive interference between the two transition pathways 3P 1/2 -4D and 3P 3/2 -4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na 2 -Na system is experimentally observed. A good agreement between the theoretical and experimental results is obtained.
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)4D)4D) and ${3P}_{3/2}\ensuremath{-}5S$ (or 4D)4D)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 have studied theoretically constructive interference via collision-aided radiative excitation in an open fourlevel system using a density matrix approach.The four-leval system consists of a Λ-type three-level quantum-beat configuration driven by one laser field and a fourthe level coupled by a vacuum mode.It is shown that through the incoherent process (collision),coherence between widely-separated doublets and subsequent constructive interference can be realized.We analyse the effects of the collision-induced coherent and incoherent decay rates,laser intensity,and energy separation of the doublets on the interference.Meanwhile,the constructive interference between the two transition pathways 3P1/2-4D and 3P3/2-4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na2-Na system is experimentally observed.A good agreement between the theoretical and experimental results is obtained.
An experimental observation of the competition between quantum interference and stimulated electronic Raman scattering (SERS) via equal frequency hybrid excitation and collision aided radiative excitation in a Na 2 Na system is reported for the first time. It is found that the SERS for 3P 1/2,3/2 4P are suppressed and the optically pumped stimulated emission (OPSE) for 5S 4P are enhanced dramatically at a particular excitation wavelength where constructive quantum interference between two transitions 3P 1/2 5S and 3P 3/2 5S in atomic sodium takes place. A theoretical analysis based on the dressed atom approach is carried out to explain the experimental results.
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.
An experimental investigation of the atomic-Na 3s 2^{2}2${\mathit{S}}_{1/2--}$5s 2^{2}2S1/2{\mathit{S}}_{1/2}S1/2​ two-color two-photon polarization spectrum has been made. Measurements of the linear polarization degree of the two-photon transition were made for one laser tuned within a \ifmmode\pm\else\textpm\fi{}100 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ range of the atomic-Na 3p 2^{2}2Pj{\mathit{P}}_{\mathit{j}}Pj​ levels, with the second adjusted to satisfy the two-photon resonance condition. The relatively short-pulse (\ensuremath{\sim}0.5 ns) lasers used eliminate effects on the spectrum due to atomic-Na hyperfine interactions and radiation trapping, while greatly reducing depolarization due to collisions with Ar gas. In the absence of collisions, the measured polarization spectrum is in excellent agreement with calculations. Measurements of the Ar pressure dependence of the spectrum revealed strong depolarization in the vicinity of resonant excitation through the 3p 2^{2}2P3/2{\mathit{P}}_{3/2}P3/2​ level. A collisional depolarization cross section of 200(30) \AA{} for this process was deduced from the data.