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Coherent population transfer in a three-level Lambda system driven by unmatched Gaussian pulses

Hui Sun, Hong Guo, Dongmei Deng +5 more

Journal of the Korean Physical SocietyJan 1, 20041 citation

Ultrafast control of coherent population transfer with a train of femtosecond pulse pairs

Xihua Yang, Zhen Wang, Zhenhua Zhang +1 more

Optics CommunicationsOct 18, 20097 citations

Coherent population transfer in four-level ladder systems by single frequency-chirped laser pulse

Xiaohong Li, Xianzhou Zhang, Rui-Zhou Zhang

物理学前沿：英文版Jul 30, 20092 citations

Ultrafast coherent population transfer with a train of weak femtosecond pulse pairs

Xihua Yang, Zhenhua Zhang, Xiaona Yan

We investigate ultrafast coherent population transfer in a Λ-type three-level system driven by a train of weak phase-locked pump-Stokes femtosecond pulse pairs, where the pump and Stokes pulses in each pair are applied in counterintuitive order, similar to that in the stimulated Raman adiabatic passage technique. It is shown that due to temporal constructive quantum interference and the subsequent coherent accumulation, complete population transfer can be achieved by a few pulse pairs with suitable interpair and intrapair time delays even if a single pair of pulses in the train is so weak that nearly no population transfer can take place. The method is efficient and robust to moderate variations in the interpair and intrapair time delays, number of pulse pairs, and laser intensity, which is particularly favorable to coherent population transfer in quantum systems with weak oscillator strengths.We investigate ultrafast coherent population transfer in a Λ-type three-level system driven by a train of weak phase-locked pump-Stokes femtosecond pulse pairs, where the pump and Stokes pulses in each pair are applied in counterintuitive order, similar to that in the stimulated Raman adiabatic passage technique. It is shown that due to temporal constructive quantum interference and the subsequent coherent accumulation, complete population transfer can be achieved by a few pulse pairs with suitable interpair and intrapair time delays even if a single pair of pulses in the train is so weak that nearly no population transfer can take place. The method is efficient and robust to moderate variations in the interpair and intrapair time delays, number of pulse pairs, and laser intensity, which is particularly favorable to coherent population transfer in quantum systems with weak oscillator strengths.

Journal of Modern OpticsAug 10, 20098 citations

Enhanced selectivity and efficiency of coherent population transfer via a train of pulse pairs

Xihua Yang, Zhenhua Zhang, Xiaona Yan +1 more

We propose a way to significantly enhance selectivity and efficiency of coherent population transfer in a $\ensuremath{\Lambda}$-type four-level system with a closely spaced doublet in the final state by using a train of counterintuitively ordered pump-Stokes pulse pairs. Due to temporal constructive and destructive quantum interference between the sequential transitions and subsequent coherent accumulation and annihilation in the time domain, the spectral resolution of selective and perfect population transfer to either of the final states can be improved by more than one order of magnitude as compared to the conventionally widely used stimulated Raman adiabatic passage and chirped adiabatic passage techniques, which can also be well understood as a result of the formation of a comblike structure of the pulse train spectrum in the frequency domain. Moreover, an arbitrary coherent superposition between the closely separated doublet can be achieved by suitably tuning the repetition period and detuning of the laser fields. This method has potential applications in control of chemical reactions and quantum information processing.We propose a way to significantly enhance selectivity and efficiency of coherent population transfer in a $\ensuremath{\Lambda}$-type four-level system with a closely spaced doublet in the final state by using a train of counterintuitively ordered pump-Stokes pulse pairs. Due to temporal constructive and destructive quantum interference between the sequential transitions and subsequent coherent accumulation and annihilation in the time domain, the spectral resolution of selective and perfect population transfer to either of the final states can be improved by more than one order of magnitude as compared to the conventionally widely used stimulated Raman adiabatic passage and chirped adiabatic passage techniques, which can also be well understood as a result of the formation of a comblike structure of the pulse train spectrum in the frequency domain. Moreover, an arbitrary coherent superposition between the closely separated doublet can be achieved by suitably tuning the repetition period and detuning of the laser fields. This method has potential applications in control of chemical reactions and quantum information processing.

Physical Review ASep 27, 201011 citations

Optimal pulse sequences for population transfer in the three level lambda system

Praveen Kumar, Vladimir S. Malinovsky, Svetlana Malinovskaya

Bulletin of the American Physical SocietyMay 27, 20100 citations

Enhancement of coherent population transfer in a double Λ-type four-level system via a train of pulse pairs

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Enhancement of coherent population transfer in a double Λ-type four-level system via a train of pulse pairs

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