Quantum coherence and non-Markovianity of an atom in a dissipative cavity under weak measurement

【作者】 刘禹； 邹红梅； 方卯发；

【Author】 Yu Liu;Hong-Mei Zou;Mao-Fa Fang;Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education,College of Physics and Information Science,Hunan Normal University;

【机构】 Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education,College of Physics and Information Science,Hunan Normal University； 湖南师范大学；

【摘要】 Quantum coherence and non-Markovianity of an atom in a dissipative cavity under weak measurement are investigated in this work. We find that: the quantum coherence obviously depends on the initial atomic state, the strength of the weak measurement and its reversal, the atom–cavity coupling constant and the non-Markovian effect. It is obvious that the weak measurement effect protects the coherence better. The quantum coherence is preserved more efficiently for larger atom–cavity coupling. The stronger the non-Markovian effect is, the more slowly the coherence reduces. The quantum coherencecan be effectively protected by means of controlling these physical parameters.更多还原

【Abstract】 Quantum coherence and non-Markovianity of an atom in a dissipative cavity under weak measurement are investigated in this work. We find that: the quantum coherence obviously depends on the initial atomic state, the strength of the weak measurement and its reversal, the atom–cavity coupling constant and the non-Markovian effect. It is obvious that the weak measurement effect protects the coherence better. The quantum coherence is preserved more efficiently for larger atom–cavity coupling. The stronger the non-Markovian effect is, the more slowly the coherence reduces. The quantum coherencecan be effectively protected by means of controlling these physical parameters.更多还原