Engineering Knill–Laflamme–Milburn Entanglement via Dissipation and Coherent Population Trapping in Rydberg Atoms
Rui Li1 , Shuang He2 , Zhi-Jun Meng1 , Zhao Jin3 , and Wei-Jiang Gong1*
1 College of Sciences, Northeastern University, Shenyang 110819, China2 Aviation University of Air Force, Changchun 130022, China3 NCO School, Army Academy of Artillery and Air Defense, Shenyang 110867, China
Abstract ：We present a scheme for dissipatively preparing bipartite Knill–Laflamme–Milburn (KLM) entangled state in a neutral atom system, where the spontaneous emission of excited Rydberg states, combined with the coherent population trapping, is actively exploited to engineer a steady KLM state from an arbitrary initial state. Instead of commonly used antiblockade dynamics of two Rydberg atoms, we particularly utilize the Rydberg–Rydberg interaction as the pumping source to drive the undesired states so that it is unnecessary to satisfy a certain relation with laser detuning. The numerical simulation of the master equation signifies that both the fidelity and the purity above 98$\%$ is available with the current feasible parameters, and the corresponding steady-state fidelity is robust to the variations of the dynamical parameters.
收稿日期: 2023-03-10
出版日期: 2023-05-29
:
03.67.Bg
(Entanglement production and manipulation)
03.65.Ud
(Entanglement and quantum nonlocality)
42.50.Dv
(Quantum state engineering and measurements)
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2023, Vol. 40 
