| 分子磁体与环境的纠缠和退相干 |
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| 引用本文： | 聂一行,赵华,梁军军,梁九卿.分子磁体与环境的纠缠和退相干[J].低温物理学报,2004,26(3):216-222. |
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| 作者姓名： | 聂一行 赵华 梁军军 梁九卿 |
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| 作者单位： | 1. 山西大学理论物理研究所,山西,太原,030006;雁北师院物理系,山西,大同,037000
2. 山西大学理论物理研究所,山西,太原,030006 |
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| 基金项目： | 国家自然科学基金，山西省自然科学基金 |
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| 摘 要： | 本文研究了双轴分子磁体在耗散环境中的相干量子隧穿,作为环境的声子库抑制了相干量子隧穿,从而引起分子磁体中薛定谔猫态的退相干. 而环境内部声子之间的相互作用会导致分子磁体与热库之间退耦合,于是对退相干有一定的抑制作用. 在绝热近似和非绝热近似下,借助于约化密度矩阵计算了超Ohmo耗散中分子磁体与环境之间的纠缠度,当纠缠达到最大时,相干隧穿被完全抑制.
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| 关 键 词： | 分子磁体 相干隧穿 退相干 纠缠 |
| 修稿时间： | 2003年10月13 |
ENTANGLEMENT BETWEEN MOLECULAR MAGNET AND ENVIRONMENT AND DECOHERENCE |
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| NIE YI-HANG , ZHAO HUA LIANG JUN-JUN LIANG JIU-QING Institute of Theoretical Physics,Shanxi University,Taiyuan.ENTANGLEMENT BETWEEN MOLECULAR MAGNET AND ENVIRONMENT AND DECOHERENCE[J].Chinese Journal of Low Temperature Physics,2004,26(3):216-222. |
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| Authors: | NIE YI-HANG ZHAO HUA LIANG JUN-JUN LIANG JIU-QING Institute of Theoretical Physics Shanxi University Taiyuan |
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| Institution: | NIE YI-HANG 1,2 ZHAO HUA 1 LIANG JUN-JUN 1 LIANG JIU-QING 1 1Institute of Theoretical Physics,Shanxi University,Taiyuan 030006 2Department of Physics,Yanbei Normal Institute,Datong 037000 |
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| Abstract: | We study the coherent quantum tunneling in a biaxial molecular magnet with dissipation of the environment which results in the suppression of the tunneling and therefore the decoherence of Schrodinger cat states in molecular magnet. The interphonon interaction leads in an effective decoupling of the spin system from the phonon bath and therefore decreases the entanglement and decoherence. The degree of entanglement between the magnet and environment is evaluated explicitly with the help of reduced density matrix under adiabatic and nonadiabatic approximation. When the entanglement approaches maximum value the coherent tunneling is suppressed completely. |
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| Keywords: | molecular magnet coherent tunneling decoherence entanglement |
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