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arXiv 1012.4268quant-phgr-qc
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非惯性系中费米子系统的多体纠缠

Multipartite entanglement of fermionic systems in noninertial frames

Jieci Wang, Jiliang Jing

备注：
12 pages, 3 figures
发表信息：
Phys. Rev. A 83 (2011) 022314
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摘要：

研究了三量子比特费米子系统在一个或两个子系统加速时的两体纠缠和三体纠缠。结果表明，随着加速度的增加，所有的单缠结减小。然而，与标量情况不同，这里的单缠结${\cal N}_{C_I(AB_I)}$和${\cal N}_{C_I(AB)}$对于任何加速度都不会减少到零。研究发现，当其中一个或两个子系统加速时，系统只存在三体纠缠，说明加速不会产生二体纠缠，也不会影响系统中量子态的纠缠结构。值得注意的是，两个观察者加速的情况下的$π$ -缠结的减少速度比一个观察者加速的情况下，它减少到一个非零的最小值在无限的加速度限制。因此，我们认为在非惯性系中，qutrit系统比qubit系统更适合于执行量子信息处理任务。

英文摘要：

The bipartite and tripartite entanglement of a 3-qubit fermionic system when one or two subsystems accelerated are investigated. It is shown that all the one-tangles decrease as the acceleration increases. However, unlike the scalar case, here one-tangles ${\cal N}_{C_I(AB_I)}$ and ${\cal N}_{C_I(AB)}$ never reduce to zero for any acceleration. It is found that the system has only tripartite entanglement when either one or two subsystems accelerated, which means that the acceleration doesn't generate bipartite entanglement and doesn't effect the entanglement structure of the quantum states in this system. It is of interest to note that the $π$-tangle of the two-observers-accelerated case decreases much quicker than that of the one-observer-accelerated case and it reduces to a non-zero minimum in the infinite acceleration limit. Thus we argue that the qutrit systems are better than qubit systems to perform quantum information processing tasks in noninertial systems.

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