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arXiv quant-ph/0203060quant-phcond-mat
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不可分辨粒子系统中的量子关联

Quantum Correlations in Systems of Indistinguishable Particles

K. Eckert, J. Schliemann, D. Bruss, M. Lewenstein

摘要:

我们讨论了不可区分粒子系统中的量子关联与由分离良好的子系统组成的复合量子系统中的纠缠的关系。我们的研究是由最近的实验和理论研究的量子点和中性原子的微陷阱作为量子信息处理的工具。我们提出了可区分的粒子,玻色子和费米子在低维希尔伯特空间之间的类比。我们引进的概念,斯莱特秩的纯态对费米子和玻色子类比施密特秩对可区分的粒子。这个概念被推广到混合态,并提供了一个不可区分的粒子的相关措施。然后,我们将这些概念推广到高维希尔伯特空间中的纯费米子态和玻色子态,以及多粒子的情况。我们回顾了混合费米子态的量子关联的结果,并讨论了费米子Slater见证人的概念。在此基础上,建立了混合玻色子态的量子关联理论和玻色子Slater见证理论。在这两种情况下,我们提供的方法来构建最佳斯莱特证人,检测混合费米子和玻色子态的量子相关性的程度。

英文摘要:

We discuss quantum correlations in systems of indistinguishable particles in relation to entanglement in composite quantum systems consisting of well separated subsystems. Our studies are motivated by recent experiments and theoretical investigations on quantum dots and neutral atoms in microtraps as tools for quantum information processing. We present analogies between distinguishable particles, bosons and fermions in low-dimensional Hilbert spaces. We introduce the notion of Slater rank for pure states of pairs of fermions and bosons in analogy to the Schmidt rank for pairs of distinguishable particles. This concept is generalized to mixed states and provides a correlation measure for indistinguishable particles. Then we generalize these notions to pure fermionic and bosonic states in higher-dimensional Hilbert spaces and also to the multi-particle case. We review the results on quantum correlations in mixed fermionic states and discuss the concept of fermionic Slater witnesses. Then the theory of quantum correlations in mixed bosonic states and of bosonic Slater witnesses is formulated. In both cases we provide methods of constructing optimal Slater witnesses that detect the degree of quantum correlations in mixed fermionic and bosonic states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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