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中国物理B：英文版

Generation of steady four-atom decoherence-free states via quantum-jump-based feedback

吴奇成, 计新

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

A scheme is presented for generating steady four-atom decoherence-free states via four atoms with the Raman level configuration interacting with a single-mode vacuum cavity field by using quantum-jump-based feedback.The scheme meets the condition of a strongly dissipative cavity easily and has a simplified feedback control.Although the spontaneous emission still plays a negative role in the proposed system,we can improve the feedback control to reduce its effect.

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A scheme is presented for generating steady four-atom decoherence-free states via four atoms with the Raman level configuration interacting with a single-mode vacuum cavity field by using quantum-jump-based feedback.The scheme meets the condition of a strongly dissipative cavity easily and has a simplified feedback control.Although the spontaneous emission still plays a negative role in the proposed system,we can improve the feedback control to reduce its effect.
A robust and scalable scheme to generate a steady three-dimensional entangled state for a V-type atom and a Λ-type atom trapped in a strongly dissipative bimodal cavity is proposed by direct feedback control based on quantum-jump detection. The robustness of this scheme reflects in the insensitivity to detection inefficiencies and the strong ability against the parameter fluctuations in the feedback, driving, and coupling strengths. The influence of atomic spontaneous emission can be suppressed by using the local feedback control. The scalability is ensured that N -dimensional entangled states of two atoms can be deterministically generated.
We investigate entanglement dynamics of three driven atoms off-resonantly coupled with a single-mode cavity under quantum-jump-based feedback control. The results demonstrate that the tripartite entanglement can be effectively enhanced and the steady W state and asymmetric W states can be obtained by setting the Rabi frequencies of classical fields and choosing the local quantum feedback control. Furthermore, the tripartite decoherence-free entangled states are found when the atoms are driven by classical fields with appropriate Rabi frequencies. The asymmetric W states and W state can be converted into each other via feedback control. In theory, the multiqubit W state can be generated and stabilized by our approach.
We describe how feedback methods can be implemented to produce and stabilize entangled states of two atoms inside a cavity. Feedback control is used to engineer an effective environment dynamics, such that the entangled state to be protected is a steady state of the system. The control strategy is therefore robust with respect to external noises and fundamental decoherence sources, as spontaneous emission, for example. We also show that the scheme is mostly insensitive to practical imperfections, as detection inefficiencies and laser fluctuations.