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arXiv:1604.05893 · Optics Express

Population transfer driven by far-off-resonant fields

Z. C. Shi, W. Wang, X. X. Yi

Published Sep 13, 2016• 8 citations
arXivHTMLPDF

Abstract

For a two-level system, it is believed that a far-off-resonant driving cannot help coherent population transfer between two states. In this work, we propose a scheme to implement the coherent transfer with far-off-resonant driving. The scheme works well with both constant driving and Gaussian driving. The total time to finish population transfer is also minimized by optimizing the detuning and coupling constants. We find that the scheme is sensitive to spontaneous emission much more than dephasing. It might find potential applications in X-ray quantum optics and population transfer in Rydberg atoms as well.

DOI
10.1364/oe.24.021971

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For a two-level system, it is believed that a far-off-resonant driving cannot help coherent population transfer between two states. In this work, we propose a scheme to implement the coherent transfer with far-off-resonant driving. The scheme works well with both constant driving and Gaussian driving. The total time to finish population transfer is also minimized by optimizing the detuning and coupling constants. We find that the scheme is sensitive to spontaneous emission much more than dephasing. It might find potential applications in X-ray quantum optics and population transfer in Rydberg atoms as well.
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We have used quantum control to suppress the impact of random atom positions on coherent population transfer within atom pairs, enabling the observation of dipole-dipole driven Rabi oscillations in a Rydberg gas with hundreds of atoms. The method exploits the reduced coupling-strength sensitivity of the off-resonant Rabi frequency, and coherently amplifies the achievable population transfer in analogy to quasi-phase-matching in nonlinear optics. Simulations reproduce the experimental results and demonstrate the potential benefits of the technique to other many-body quantum control applications.
The population transfer in a four-level quasi-lambda system driven by unmatched Gaussian pulses is investigated.By using the matrix equation theory,evolutions of the populations of the four states Vs time is investigated.Numerical simulations show that the Rabi frequency intensity and detuning of pumping field have different effects on the population transfer comparing with the probe and coupling field;and spontaneously generated coherence(SGC)have little effect on population transfer.If the parameters are chosen appropriately,population can be transferred almost completely to the target state.
Nuclear coherent population transfer (NCPT) plays an important role in the exploration and application of atomic nuclei. How to achieve high-fidelity NCPT remains so far challenging. Here, we investigate the complete population transfer of nuclear states. We first consider a cyclic three-level system, based on the mixed-state inverse engineering scheme by adding additional laser fields in an open three-level nuclear system with spontaneous emission. We find the amplitude of the additional field is related to the ratio of the pump and Stokes field amplitudes. As long as an appropriate additional field is selected, complete transfer can be achieved even when the intensities of the pump and Stokes fields are exceedingly low. The transfer efficiency exhibits excellent robustness with respect to laser peak intensity and pulse delay. We demonstrate the effectiveness through examples such as 229Th,223Ra,113Cd^{229}\mathrm{Th}, ^{223}\mathrm{Ra}, ^{113}\mathrm{Cd}229Th,223Ra,113Cd, and 97Tc^{97}\mathrm{Tc}97Tc, which have a long lifetime excited state, as well as 187Re,172Yb,168Er^{187}\mathrm{Re}, ^{172}\mathrm{Yb}, ^{168}\mathrm{Er}187Re,172Yb,168Er, and 154Gd^{154}\mathrm{Gd}154Gd with a short lifetime excited state. Focusing on the case without additional coupling, we further reduce the three-level system to an effective two-level problem. We modify the pump and Stokes pulses by using counterdiabatic driving to implement high-fidelity population transfer. The schemes open up new possibilities for controlling nuclear states.
We propose a simple exact analytical solution for a model consisting of a two-level system and a polychromatically driving field. It helps us to realize a rapid complete population transfer from the ground state to the excited state, and the system can be stable at the excited state for an extremely long time. A combination of the mechanism and the Rydberg atoms successfully prepares the Bell state and multipartite WWW state, and the experimental feasibility is discussed via the current experimental parameters. Finally, the simple exact analytical solution is generalized into a three-level system, which leads to a significant enhancement of the robustness against dissipation.