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Physical Review A

Driving to the steady ground-state superposition assisted by spontaneous emission

Mingfeng Chen, Li-Tuo Shen, Rongxin Chen, Zhen‐Biao Yang

Published Sep 4, 2015• 5 citations
Publisher

Abstract

We propose a scheme for preparing a coherent ground-state superposition for an atom through external drivings assisted by spontaneous emission. In the scheme, the dynamics induced by the competition between the spontaneous emission and the external drives contributes to the superposition of the ground states. Compared with schemes based on the stimulated Raman adiabatic passage, such a scheme is more easily implemented because the preparation of special initial states is no longer needed, which simplifies the operation process. Moreover, since spontaneous emission is involved to act as a positive factor, a higher fidelity superposition state is achieved.

DOI
10.1103/physreva.92.033403

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We propose a scheme for preparing a coherent ground-state superposition for an atom through external drivings assisted by spontaneous emission. In the scheme, the dynamics induced by the competition between the spontaneous emission and the external drives contributes to the superposition of the ground states. Compared with schemes based on the stimulated Raman adiabatic passage, such a scheme is more easily implemented because the preparation of special initial states is no longer needed, which simplifies the operation process. Moreover, since spontaneous emission is involved to act as a positive factor, a higher fidelity superposition state is achieved.
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Schemes are presented for preparation for W state and high-dimensional entangled states of two atoms via adiabatic passage.In these schemes,since the quantum information is encoded in atomic ground states and the system always evolves in the dark state space so that there is no population in the atomic excited state,the atomic spontaneous emission is suppressed effectively.In addition,adiabatic passage insures that these schemes are robust to the fluctuation of the experimental parameter.Compared with previous proposals,our project saves effectively resources and can be experimentally realized more easily due to simpler operation.
We propose two relatively robust schemes to effectively generate controllable N-partite W states in atom-cavity-laser systems. In these schemes, we consider a situation where a traveling atom initially in the ground state, interacts simultaneously with the cavity-mode and the laser fields through stimulated Raman adiabatic passage and pulse area techniques in optical cavities. Losses due to atomic spontaneous emission are efficiently suppressed by employing appropriately designed atom-field couplings and suitable pulse ordering.
The shortcut to adiabaticity (STA) is a powerful technique to speed up population transfer via quantum coherent control. This paper demonstrates that STA provides a fast, robust, and efficient population transfer compared to the stimulated Raman adiabatic passage. In the ideal situation of a closed system, STA is insensitive to the detunings and Rabi frequencies, and the undesired diabatic transitions could be eliminated by the auxiliary pulses, so the complete population transfer from the initial state to the target state in the designed adiabatic passage can be rapidly achieved against the inevitable amplitude noises of the interactions and systematic errors. When we consider the situation including the environment noises, spontaneous emission from the intermediate state $|2\ensuremath{\rangle}$ in STA can be sufficiently ignored in the cases of the dark-state evolution and quantum overdamping, since the state $|2\ensuremath{\rangle}$ is thoroughly separated from the three-state system. Moreover, the diabatic transitions induced by the spontaneous emission are also sufficiently suppressed in STA.
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