Single molecular magnets as a source of continuous-variable entanglementXin-You Lü1, Ji-Bing Liu2, 1, Yü Tian1, Pei-Jun Song1 and Zhi-Ming Zhan3
1 Department of Physics, Huazhong University of Science and Technology - Wuhan 430074, PRC
2 Department of Physics, Hubei Normal University - Huangshi, 435002, PRC
3 School of Physics and Information Engineering, Jianghan University - Wuhan 430056, PRC
received 12 January 2008; accepted in final form 5 May 2008; published June 2008
published online 12 June 2008
We study the generation and evolution of continuous-variable entanglement in a single-molecular-magnets (SMM) system, where the quantum coherence effect is induced by two classical electromagnetic fields (pump and control fields). Our numerical results show that the entanglement of cavity fields can be controlled efficiently by tuning the intensity and frequency detuning of control field, and the macroscopic entangled light with long entanglement time can be realized in this SMM system, over a wide range of initial states of the cavity field. This investigation can be used for achieving the macroscopic entangled light in a solid-state medium, which is much more practical than that in an atomic or molecular medium because of its flexible design.
42.50.Dv - Quantum state engineering and measurements.
03.67.Mn - Entanglement measures, witnesses, and other characterizations.
75.50.Xx - Molecular magnets.
© EPLA 2008