期刊文献+

Quantum leakage of collective excitations of atomic ensemble induced by spatial motion

Quantum leakage of collective excitations of atomic ensemble induced by spatial motion
原文传递
导出
摘要 We generalize the conception of quantum leakage for the atomic collective excitation states. By making use of the atomic coherence state approach, we study the influence of the atomic spatial motion on the symmetric collective states of 2-level atomic ensemble due to inhomogeneous coupling. In the macroscopic limit, we analyze the quantum decoherence of the collective atomic state by calculating the quantum leakage for a very large ensemble at a finite temperature. Our investigations show that the fidelity of the atomic system will not be good in the case of atom number N →∞. Therefore, quantum leakage is an inevitable problem in using the atomic ensemble as a quantum information memory. The detailed calculations shed theoretical light on quantum processing using atomic ensemble collective qubit. We generalize the conception of quantum leakage for the atomic collective excitation states. By making use of the atomic coherence state approach, we study the influence of the atomic spatial motion on the symmetric collective states of 2-level atomic ensemble due to inhomogeneous coupling. In the macroscopic limit, we analyze the quantum decoherence of the collective atomic state by calculating the quantum leakage for a very large ensemble at a finite temperature. Our investigations show that the fidelity of the atomic system will not be good in the case of atom numberN→∞. Therefore, quantum leakage is an inevitable problem in using the atomic ensemble as a quantum information memory. The detailed calculations shed theoretical light on quantum processing using atomic ensemble collective qubit.
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2003年第6期580-588,共9页 中国科学:物理学、力学、天文学(英文版)
基金 the National Natural Science Foundation of China the Knowledge Innovation program (KIP) of the Chinese Academy of Sciences the National Fundamental Research Program of China (Grant No. 001GB309310)
关键词 QUANTUM memory ATOMIC ensemble qubit QUANTUM leakage. quantum memory atomic ensemble qubit quantum leakage
  • 相关文献

参考文献10

  • 1Fleischhauer,M,Lukin,M.D.Quantum memory for photons:Ⅰ.Dark state polaritons[].Physical Review A Atomic Molecular and Optical Physics.2002
  • 2Harris,S.E.Electromagnetically induced transparency[].Physics Today.1997
  • 3C. Mewes,M. Fleischhauer.Two-photon linewidth of light "stopping" via Electromagnetically induced transparency[].Physical Review A Atomic Molecular and Optical Physics.2002
  • 4Bennett C H,Brassard G,Crepeau C,et al.Teleporting an unknown quantum state via dual classical and einstein-podolsky-rosen channels[].Physical Review Letters.1990
  • 5Bouwmeester D,Pan J W,Mattle K,et al.Experimental Quantum Teleportation[].Nature.1997
  • 6Boschi D,Branca S,Martini F D,et al.Experimental realization of teleporting an unknown pure quantum state via dual classical and Einstein-Podolsky-Rosen channels[].Physical Review Letters.1998
  • 7FURUSAWA A,SORENSEN J L,BRAUNSTEIN S L,et al.Uncond itional Quantum Teleportation[].Science.1998
  • 8Cirac J I,Zoller P.Quantum computations with cold trapped Ions[].Physical Review Letters.1995
  • 9Bennett Charles H.Quantum information and computation[].Physics Today.1995
  • 10EkertA,Jozsa R.Quantum computation and shor's factoring algorithm[].Rev Mod Phys.1996

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部